| HTTP status code | Error code | Error message | Description |
|---|---|---|---|
| 400 | ServiceIsConfiguring | A previous configuration is pending; please try again later. | A previous configuration has not been completed. Please try again later. |
| 400 | VServerGroupProcessing | A previous configuration of the VServer group is pending; please try again later. | A previous configuration of the VServer group has not been completed. Please try again later. |
| 400 | OperationBusy | A previous operation is pending. | A previous operation is waiting to be completed. Please try again later. |
| 400 | LX_REQUEST_TOKEN_CONFLICT | The ClientToken is conflict. | The client token conflicts with another token. |
| 400 | CommodityCodeNotExists | The account can't get CommodityCode. | Failed to obtain the CommodityCode. Please try again later. |
| 400 | PAY.PAY_ORDER_FAILED | The account failed to pay order. | The account failed to pay the order. |
| 400 | PAY.INVALID_CREDIT_CARD | The account Credit card is invalid. | The credit card is invalid. |
| 400 | PAY.REFUND_FAILED | The account failed to Refund. | Failed to refund the money to the account. |
| 400 | PAY.WITHHOLDING_AGREEMENT_ILLEGAL | The account withholding agreement is illegal. | The withholding agreement of the account is invalid. |
| 400 | PAY.COUPON_NOT_EXIST | The account coupon doesn't exist. | The specified coupon does not exist. |
| 400 | PAY.STORED_CARD_NOT_EXIST | The account stored card doesn't exist. | The specified stored-value card of the account does not exist. |
| 400 | PAY.ACCOUNT_BOOK_NOT_EXIST | The account Book doesn't exist. | The specified reservation of the account does not exist. |
| 400 | PAY.TAX_CALC_FAILED | The account Tax failed to calculate. | Failed to calculate the tax of the account. |
| 400 | PAY.COUPON_NOT_MEET_CONSUMPTION_RULE | The account coupon doesn't meet consumption rule. | The coupon cannot be used, because it does not meet the rules. |
| 400 | PAY.USER_DECLINED | The account declined to pay. | The payment is declined by the account. |
| 400 | PAY.INVALID_AMOUNT | The account amount is invalid. | The payment amount is invalid. |
| 400 | PAY.AMOUNT_LIMIT_EXCEEDED | The account amount limit exceeded. | The number of accounts has reached the limit. |
| 400 | PAY.CURRENCY_NOT_SUPPORTED | The account Currency doesn't support. | The specified currency is not supported. |
| 400 | PAY.CURRENCY_INCONSISTENCY | The account Currency is inconsistency. | You must use the required currency. |
| 400 | PAY.NO_CREDIT_CARD | The account doesn't have Credit Card. | You must link a credit card to the account. |
| 400 | PAY.GET_PAY_URL_ERROR | The account failed to get Pay Url. | Failed to obtain the URL used for payment. |
| 400 | PAY.PAYMENT_PARAMETER_INVALID | The account payment parameters are invalid. | The payment parameters of the account are invalid. |
| 400 | PAY.QUERY_QUOTA_BOOK_FAILED | The account failed to query quota book. | Failed to query the quota of the account. |
| 400 | PRODUCT.INSTANCE_RELEASED | The Instance is released. | The specified instance is already released. |
| 400 | PRODUCT.INSTANCE_TYPE_NOT_EXIST | The Instance type doesn't exist. | The specified instance type does not exist. |
| 400 | PRODUCT.INSTANCE_TYPE_NOT_SUPPORTED | The Instance type doesn't support. | The specified instance type is not supported. |
| 400 | PRODUCT.NOT_AVAILABLE_IZ | The Instance zone id doesn't support. | The specified zone ID is not supported. |
| 400 | PRODUCT.INSUFFICIENT_STOCK | The product stock is insufficient. | The request failed due to the shortage of stocks. |
| 400 | PURCHASE.NO_VAILD_PURCHASE | The purchase is invalid. | The purchase failed. |
| 400 | PURCHASE.PURCHASE_QUERY_FAILED | The purchase failed to query. | Failed to query the purchase. |
| 400 | ORDER.ORDER_AMOUNT_ILLEGAL | The order amount is illegal. | The number of orders is invalid. |
| 400 | ORDER.NOT_ENOUGH_ACTIVITY_STOCK | The order activity stock is not enough. | The request failed due to the shortage of stocks. |
| 400 | ORDER.SYS_CONSTRAINT_INVALID | The order system constraint is invalid. | The attributes of the product in the order failed to pass the constraint verification. |
| 400 | ORDER.QUANTITY_INVALID | The maximum number of SLB instances is exceeded. | The number of SLB instances has reached the limit. |
| 400 | ORDER.PERIOD_INVALID | The order period is invalid. | The payment cycle is invalid. |
| 400 | ORDER.BID_USER_ ORDER_FORBIDDEN | The order of bid user is forbidden. | Bid users are not allowed to place orders. |
| 400 | ORDER.ACCOUNT_STATUS_ILLEGAL | The order account status is illegal. | The status of the account does not permit the order. |
| 400 | ORDER.QUOTA_EXCEEDED | The order quota exceeded. | The total number of instances has reached the quota. To increase the quota, open a ticket. |
| 400 | ORDER.OPEND | The account order is open to buy loadbalancer. | You must activate the SLB service for the account. |
| 400 | ORDER.NO_REAL_NAME_AUTHENTICATION | The account is not real name authentication. | The account must pass the real-name verification. |
| 400 | ORDER.ARREARAGE | The account is arrearage. | The balance of your account is insufficient. Please update the status of your account and try again. |
| 400 | ORDER.INSTANCE_HAS_INACTIVE_CHANGE | The instance has inactive change. | An invalid order of instance specification change exists. |
| 400 | ORDER.INST_HAS_UNSETTLED_BILLS | The instance has unsettled bills. | The instance has unsettled bills. |
| 400 | ORDER.INST_HAS_UNPAID_ORDER | The instance has unpaid order. | The instance has unpaid bills. |
| 400 | PRICE.PRICING_PLAN_NOT_FOUND | The instance pricing plan is not found. | Failed to find the pricing plan of the specified instance. |
| 400 | PRICE.PRICING_PLAN_RESULT_NOT_FOUND | The instance pricing plan result is not found. | Failed to find the pricing plan of the specified instance. Please open a ticket. |
| 400 | PRICE.TAXING_ERROR | The instance pricing tax is error. | The price tax of the instance is invalid. |
| 400 | PRICE.INVALID_INQUIRY_PARAMETER | The instance pricing inquiry parameter is invalid. | The instance pricing query parameter is invalid. |
| 400 | PRICE.INQUIRY_FAILED | The instance pricing inquiry is failed. | Failed to query the pricing of the specified instance. |
| 400 | COMMODITY.INVALID_COMPONENT | The instance component is invalid. | The instance component is invalid. |
| 400 | AUTH.RAM_AUTH_FAILED | The ram authentication of sub-user is failed. | The access control authentication of the RAM user failed. |
| 400 | RISK.RISK_CONTROL_REJECTION | The account is rejected by risk control system. | The account is rejected by the risk control system. |
| 400 | CreateOrderFailed | The account failed to create order. | Failed to create the order. |
| 400 | OrderFailed | The account failed to create order. | Failed to create the order. Please try again later. |
| 400 | ARREARAGE | The account has some ARREARAGE. | The account has overdue bills. |
| 400 | INSUFFICIENT_BALANCE | The account Balance is insufficient. | The balance of the account is insufficient. |
| 400 | NO_REAL_NAME_AUTHENTICATION | The account should be Real Name Authenticated. | The account must pass the real-name verification. |
| 400 | INVALID_COMPONENT | This account can't buy such type loadbalancer. | The account is not allowed to buy the specified type of instance. Please choose a different instance type. |
| 400 | NOCARD | User Profile doesn't have card. | You must link the account to a bank card first. |
| 400 | RuleNotSupport | Rule is not support in the tcp type listener. | TCP listeners do not support forwarding rules. |
| 400 | UserProfileNotComplete | User profile is not completed. | You must provide required user information first. |
| 400 | InvalidParameter | Invalid parameter in the request. | One or more parameters in the request are invalid. |
| 400 | URLNotSupport | the URL in the rule is invalid. | The specified URL in the rule is invalid. Please check if the URL is correct. |
| 409 | ServiceIsStopping | The specified Listener is stopping, please retry later. | The specified listener is being stopped. Please try again later. |
| 400 | AccountHasArrearage | Account has some arrearage. | The account has overdue bills. |
| 404 | InvalidRuleId.NotFound | Rule does not exist. | The specified rule does not exist. |
| 400 | OverQuota | Instance num exceeded Quota. | The number of instances has reached the quota. |
| 400 | NoNameAuthentication | Account should be Name Authenticated. | The account must pass the real-name verification. |
| 400 | InvalidOwnerAccount | The input parameter OwnerAccount is invalid. | The specified OwnerAccount is invalid. |
| 400 | InvalidResourceOwnerAccount | The input parameter ResourceOwnerAccount is invalid. | The specified ResourceOwnerAccount is invalid. |
| 400 | InvalidOwnerId | The specified OwnerId or OwnerAccount is invalid. | The specified OwnerId or OwnerAccount is invalid. |
| 400 | InvalidOwnerId | The input parameter OwnerId or OwnerAccount is invalid. | The specified OwnerId or OwnerAccount is invalid. Please check if the value is correct. |
| 400 | OverQuota | The Total is over the quota. | The total number has reached the quota. Please reduce the number and try again. |
| 400 | ServiceUnavailable | The vpc subnet is not exist. | The VPC subnet does not exist or no IP address is available in the CIDR block of the VSwitch. Please check if the value is correct. |
| 400 | RegionNotSupport | The specified region not supported. | The specified region is not supported. |
| 400 | ListenerNumberOverLimit | The maximum number of listeners is exceeded. | The number of listeners has reached the limit. The number of listeners must be no more than 30. |
| 400 | KeyFormatError | The specified ServerCertificate is incorrectly formatted. | The format of the ServerCertificate parameter is incorrect. |
| 400 | InvalidParameter | The Lb Name is Not supported. | The specified parameter is invalid. |
| 400 | InvalidParameter | The Instance is Not Available. | The specified instance is not available. |
| 449 | SystemBusy | The system is busy. | The system is busy. Please try again later. |
| 400 | ActionNotAllowed | The action is not allowed. | The operation is not allowed. |
| 400 | UserNotAllowed | The user is not allowed, please submit the application. | You are not authorized to perform this operation. Please open a ticket. |
| 400 | SourceItemsQuotaOverLimit | The maximum number of SourceItems is exceeded. | The number of IP addresses has reached the limit of the SourceItems parameter. The number of IP addresses cannot exceed 300. |
| 400 | ActionNotAllowed | The load balancer instance does not allow to be upgrade. | The specified SLB instance is not allowed to be upgraded. |
| 400 | ActionNotAllowed | Locked for any Business Reason. | The SLB instance is locked due to service reasons. |
| 400 | ActionNotAllowed | Locked for any Operate Reason. | The instance is locked due to specification change. It will be unlocked at 00:00 the next day. |
| 400 | ActionNotAllowed | Listener AccessControl Status is Incorrect. | The access control function of the listener is disabled. |
| 400 | InvalidParameter | The Protocol is not Support | The protocol is not supported. |
| 400 | InvalidParameter | The listen bandwidth is not Support | The specified bandwidth of the listener is invalid. |
| 400 | ActionNotAllowed | The Intranet LB's InternetChargeType is not allowed change to paybybandwidth. | The specified SLB instance is not allowed to be changed to bandwidth-based billing. |
| 403 | Forbbiden.SubUser | illegal bid | A problem exists with the account. |
| 400 | InvalidParameter | The specified resource does not exist. | The specified resource does not exist. |
| 409 | BackendServer.configuring | A previous configuration of the load balancer is pending; please try again later. | A previous configuration of the SLB instance has not been completed. Please try again later. |
| 400 | ObtainIpFail | The specified BackendServers is invalid; some of the specified backend servers do not exist or are not running. | The specified BackendServers is invalid. Some of the specified backend servers do not exist or are not running. Please check if the value is correct. |
| 503 | ServiceUnavailable | The specified region not support VPC. | The specified region does not support VPC. |
| 400 | InvalidParameter | the special internet EIP donot support the VPC network type. | The specified EIP does not support the VPC network type. |
| 400 | InvalidParameter | The specified load balancer does not support the network type of the ECS instance. | The SLB instance does not support the ECS instance of the specified network type. Please choose an ECS instance of a different network type. |
| 400 | InvalidParameter | The specified RegionId does not exist. | The specified RegionId does not exist. Please check if the value is correct. |
| 400 | InvalidParameter | The specified vpc cloud instance has deleted | The specified VPC has already been deleted. |
| 400 | InvalidParameter | The specified vpc cloud instance is deleteing. | The specified VPC is being deleted. |
| 400 | PARAMETER_FIELD_ERROR | The specified param is invalid. | The specified parameter is invalid. |
| 400 | InvalidParameter | The vpc info of LB is empty. | The VPC information of the specified instance is empty. Please check if the VPC is valid. |
| 400 | InvalidParameter | The vpc Ip is exist. | The specified VPC IP address is in use. Please use another IP address and try again. |
| 400 | InvalidParameter | The Ip is not Supported. | The specified IP address is not supported. |
| 400 | InvalidParameter | The RsList is illegal. | The specified parameter is invalid. |
| 400 | InvalidParameter | The Tunnel id is invalid. | The specified tunnel ID is invalid. |
| 400 | InvalidParameter | The Rs IP is empty. | Failed to obtain the IP address of the backend server. |
| 400 | InvalidParameter | The VmName is emtpy. | You must specify the ServerId. |
| 400 | InvalidParameter | The App id is invalid. | The specified app ID is invalid. |
| 400 | InvalidParameter | The Vgw ip is empty. | You must specify the Virtual Gateway IP address. |
| 400 | InvalidParameter | The vm address is not Support. | The IP address of the backend server does not permit this operation. Please change the IP address of the backend server and try again. |
| 400 | InvalidParameter | The site is not exist. | The specified primary and secondary zones are invalid. |
| 400 | InvalidParameter | The serviceUnit and eip is not match. | The service unit and EIP do not match. |
| 400 | InvalidParameter | The vgw ip is not support. | The specified Virtual Gateway IP address does not support this operation. |
| 503 | ServiceUnavailable | Illegal Service. | The service is unavailable. |
| 503 | ServiceUnavailable | Vpc Service error. | A VPC service error has occurred. Please check the parameter and try again. |
| 503 | ServiceUnavailable | System exception. | A system error has occurred. Please try again. |
| 500 | InternalError | Illegal sign. | The system is busy. Please try again later. |
| 500 | InternalError | Query ecs info fail. | Failed to query the ECS information. |
| 500 | InternalError | Illegal timestamp. | The specified timestamp is invalid. |
| 500 | InternalError | Illegal format. | The format is invalid. |
| 500 | InternalError | Illegal user. | The user is illegal. |
| 500 | InternalError | Illegal sign type. | The signature type is invalid. |
| 500 | InternalError | Illegal aliyun idkp. | The account credentials are invalid. |
| 503 | ServiceUnavailable | The cloud instance id is invaild. | The specified instance ID is invalid. |
| 400 | InvalidParameter | The type is invalid. | The specified type is invalid. Please check if the type permits the operation. |
| 400 | InvalidParameter | The lvsgw vip is same. | The specified gateway IP address is in use. |
| 400 | InvalidParameter | The resource already exists. | The specified resource already exists. |
| 400 | InvalidParameter | The resource status is invalid. | The resource status is invalid. |
| 400 | UnsupportedOperationonfixedprotocalport | The operation is not supported by the protocol of the specified port. | The protocol of the specified port does not support the operation. Please check if the protocol of the port is correct. |
| 500 | InternalError | The request processing has failed due to backend service exception. | The request failed due to an error of the backend service. |
| 400 | PrivateKeyEncryption | Key has Encrypted . | Private keys do not need to be encrypted. |
| 400 | CertificateNotMatchPrivateKey | Certificate and key does not match. | The certificate and key do not match. Please check if the certificate and key are correct. |
| 400 | InvalidParameter | The specified parameter ServerCertificate format is error. | The format of the ServerCertificate is incorrect. Please modify the format and try again. |
| 400 | CertificateAndPrivateKeyIsRefered | Certificate and PrivateKey Is Refered. | The specified certificate is being used by the listener. |
| 400 | InvalidParameter | The specified parameter ServerCertificateId is empty. | The specified ServerCertificateId is null. |
| 400 | InvalidParameter | The specified parameter ServerCertificateId is not Support. | The specified ServerCertificateId is not supported. |
| 400 | InvalidParameter | The specified parameter ServerCertificate or Key is empty. | The specified ServerCertificate or Key is null. |
| 400 | InvalidParameter | The specified parameter key format is error. | The format of the key is incorrect. |
| 400 | InvalidParameter | The specified port is not valid. | The specified port is invalid. |
| 400 | InvalidParameter | The specified bandwidth is not valid. | The specified bandwidth is invalid. |
| 400 | VipNotMatchRspool | The vip protocol is not match with Rspool. | The backend server group does not match the listener. Please check the configurations of the backend server group and listener. |
| 400 | InvalidParameter | The specified Bandwidth is invalid. It exceeds the maximum bandwidth available to the instance. | The specified bandwidth is invalid. The total bandwidth values of all listeners in the instance has exceeded the maximum bandwidth of the instance. |
| 400 | InvalidParameter | The specified Bandwidth is invalid. | The specified bandwidth is invalid. Please check if the bandwidth is correct. |
| 400 | InvalidParameter | The specified SourceItems is invalid. | The specified SourceItems is invalid. Please check if the value is correct. |
| 400 | VipTooManyListeners | The total number of input listeners exceeds max supported number: 10 | Up to 10 listeners can be created for an instance. The number of listeners has exceeded the limit. |
| 400 | InvalidParameter | The specified protocol is not valid. | The specified protocol is invalid. |
| 404 | InvalidParameter | The specified VServerGroupId does not exist. | The specified VServerGroupId does not exist. Please check if the value is correct. |
| 400 | InvalidParameter | Illegal user ID. | The user ID is invalid. |
| 400 | InvalidParameter | User ID is null | You must specify the user ID. |
| 400 | InvalidParameter | The specified parameter: lb_type is not valid. | The specified lb_type is invalid. |
| 400 | InvalidParameter | The specified parameter: mode is not valid.. | The specified mode is invalid. |
| 503 | ServiceUnavailable | The specified loadbalancer name has been used. | The specified SLB instance name is being used by another instance. |
| 400 | TcpNotSupportForHybridLb | Hybrid type loadbalancer doesn't support TCP type listener | Hybrid SLB instances do not support TCP listeners. |
| 400 | InvalidParameter | The specified BackendServers is invalid. | The specified BackendServers is invalid. Please check if the value is correct. |
| 400 | InvalidParameter | The specified BackendServers is invalid, as the Port value should be in [1, 65535]. | The specified BackendServers is invalid. Please make sure that the port number falls into the range of 1 to 65535. |
| 400 | UnsupportedOperation | The Loadbalancer doesn't support this function. | SLB does not support this function. |
| 400 | TooManyBackendServers | The total number of input real servers exceeds max supported number: 20 | Up to 20 backend servers can be specified in one request. The number of specified backend servers has exceeded the limit. |
| 400 | InvalidParameter | The specified parameter is not valid. | The specified parameter is invalid. Please check if the value is correct. |
| 400 | InvalidParameterLength | The specified parameter length is not valid. | The length of the parameter value is invalid. |
| 400 | InvalidAuthorization | The Request is not authorization. | The request is not authorized. |
| 500 | InternalInvokeError | The internal invoking has failed due to unknow error. | The request failed to be processed due to unknown errors. |
| 400 | OssInstanceDataNotFound | The oss instance of the demand is not exist | The specified OSS instance does not exist. |
| 400 | InvalidAuthorizationStatus | The authorization status is not valid. | The authorization status is invalid. |
| 500 | InternalInvokeError | The internal invoking has failed. | An internal error has occurred. |
| 400 | InsufficientCapacity | There is insufficient capacity available for the requested | The number of SLB instances has reached the quota. To increase the quota, open a ticket. |
| 400 | ProcessingSameRequest | The same request is being processed. Please try later. | A same request is being processed. Please try later. |
| 404 | InvalidRegionId.NotFound | The specified RegionId does not exist. | The specified RegionId does not exist. Please check if the product is available in the specified region. |
| 404 | InvalidServerId.NotFound | The specified ServerId does not exist. | The specified ServerId does not exist. Please check if the value is correct. |
| 503 | InvalidParameter | The request has failed due to a temporary failure of the server. | The request failed due to a server failure. |
| 400 | InvalidParameter | Specified parameter is not valid. | The specified parameter is invalid. |
| 503 | ServiceUnavailable | The request has failed due to a temporary failure of the server now. | The request failed due to a server failure. |
| 400 | UnsupportedOperation | The specified action is not supported. | The operation is not supported. |
| 400 | ListenerAlreadyExists | A listener with the specified port already exists | The specified port number is already associated with another listener. |
| 404 | ListenerNotFound | You have not created a listener for the specified port of the load balancer. | You must create a listener for the specified port of the SLB instance first. |
| 404 | CheckedListenerNotFound | No health-checked Listener to the specified port of the Load Balancer. | You must configure health checks for the specified SLB instance first. |
| 400 | IpNotAvailable | The specified network type load balancer load balancer . | The specified network type of the SLB instance is invalid. Please check if the value is correct. |
| 400 | InvalidWeight.Malformed | A specified weight is not valid. | The specified weight is invalid. |
| 500 | IncorrectListenerAccessControlStatusStatus | Current listener access control status does not support this operation. | The access control status of the listener does not permit this operation. |
| 400 | MissingParameter | The combination of some parameters violates the spec. | The request parameters are in conflict. |
| 400 | UnsupportedParameter | The specified parameter is not unsupported. | One or more parameters are not supported. |
| 403 | Forbidden | User not authorized to operate on the specified resource. | You are not authorized to operate on this resource. Please apply for RAM permissions and try again. |
| 400 | TooManyBackendServers | The backend server parameter has too many entries. | The number of specified backend servers in a request has exceeded the limit. |
| 403 | Forbbiden.SubUser | TUser not authorized to operate on the specified resource as your account is created by another user. | This user is not authorized to operate the resources under the specified account. Please authorize the user first. |
| 400 | InvalidBackendServers.Inconsistent | All BackendServers on one Specified LoadBalancer have to be in the same vpc or all classic | All backend servers of an SLB instance must belong to the same VPC or classic network. |
| 400 | InvalidServerId.NotFound | The specified server is not found. | The specified backend server does not exist. |
| 400 | InvalidIdentity | The request identity was not allowed operated. | The request authentication failed. |
| 400 | DomainAlreadyExists | Protected DomainName already exists. | The specified domain name already exists. |
| 400 | DomainNotExisted | Don't delete or update not existed protected DomainName. | The specified domain name does not exist. |
| 400 | IpListItemFormatError | please check the ip list item format error. | The format of the IP address list is incorrect. |
| 400 | SecurityNotSupport | security function not support on this listener. | The specified listener does not support the security function. |
| 400 | DomainExist | rule with same domain and url already exists in specified vip | A rule with the same domain name and URL already exists. |
| 400 | TooManyRules | the number of rules under specified vip is beyond maximum limit. | The number of rules added for the listener has exceeded the limit. |
| 400 | RspoolVipExist | there are vips associating with this vServer group. | The specified VServer group is already associated with another listener. Please disassociate the VServer group first. |
| 400 | RspoolRuleExist | there are rules associating with this vServer group. | The specified VServer group is associated with a forwarding rule. Please disassociate the VServer group from the forwarding rule. |
| 400 | BackendServersMalformed | the specified parameter BackendServers is unavailable. | The specified BackendServers is invalid. |
| 400 | RuleListMalformed | the specified parameter RuleList is unavailable. | The specified RuleList is invalid. |
| 400 | DomainMalformed | the specified domain in RuleList parameter is unavailable. | The format of the specified domain is invalid. |
| 400 | UrlMalformed | the specified url in RuleList parameter is unavailable. | The specified URL in the RuleList parameter is invalid. |
| 400 | NetworkConflict | there are network conflicts in specified parameter. | Networks specified in the parameters conflict with each other. Please check if the values are correct. |
| 400 | VServerGroupEmpty | The specified VServerGroupId is invalid; it does not contain vServers. | The specified VServerGroupId is invalid. Make sure that it contains VServers and try again. |
| 400 | VpcZoneNotSupportCreate | The specified zone dont not supported . | The specified zone does not support VPC. |
| 400 | VpcStatusError | the specified vpc status is creating. | The specified VPC is being created. |
| 400 | TagCreateCountLimit | tags create count limit exceeded. | The number of tags has exceeded the quota. |
| 400 | TagCountLimit | Tags count limit exceeded. | The number of tags has exceeded the quota. |
For a list of error codes, visit the API Error Center.