If a Message Queue for Apache RocketMQ API operation is called successfully, ResponseCode=200 is returned to the client. If the call fails, error codes and the corresponding descriptions are returned. You can find solutions based on the error codes listed in the following table.

Error code Symptom and cause Solution
ONS_SYSTEM_ERROR An exception occurred in the Message Queue for Apache RocketMQ backend. Submit an Alibaba Cloud ticket to contact Customer Services.
ONS_SERVICE_UNSUPPORTED The request is not supported in the corresponding region. Contact Customer Services to check the regions where the API operation is available.
ONS_INVOKE_ERROR The call of the API operation failed. Contact Customer Services.
BIZ_FIELD_CHECK_INVALID Parameter verification failed. Check whether input parameters are valid based on the API reference.
BIZ_TOPIC_NOT_FOUND The topic was not found. Check whether the input topic is valid or whether the topic has been created.
BIZ_SUBSCRIPTION_NOT_FOUND The group ID of the target subscription was not found. Check whether the group ID has been created or whether the search criteria are correct.
BIZ_PUBLISHER_EXISTED The specified group ID already exists. Try again with a new group ID.
BIZ_SUBSCRIPTION_EXISTED The specified group ID already exists. Try again with a new group ID.
BIZ_CONSUMER_NOT_ONLINE The consumer instance with the specified group ID was offline. Ensure that the consumer instance is online and then try again.
BIZ_NO_MESSAGE No message matches the search criteria. Check the search criteria and check whether any message was sent within the query range.
BIZ_REGION_NOT_FOUND The requested region was not found. Check whether the region parameter in the request is valid.
BIZ_TOPIC_EXISTED The specified topic already exists. Try again with a new topic name.
BIZ_PUBLISH_INFO_NOT_FOUND The requested group ID was not found. Check whether the group ID exists or whether the request condition is correct.
EMPOWER_EXIST_ERROR The current authorization already exists. Verify the request parameters and try again or query the authorization.
EMPOWER_OWNER_CHECK_ERROR The current user is not the owner of the authorized topic. Confirm the ownership of the resource.