MySQL error code

MySQL error 3021

MySQL server error 3021 is ER_REPLICA_CHANNEL_IO_THREAD_MUST_STOP, reported with SQLSTATE HY000.

This operation cannot be performed with a running replica io thread; run STOP REPLICA IO_THREAD FOR CHANNEL '%s' first.

Error	3021
Name	ER_REPLICA_CHANNEL_IO_THREAD_MUST_STOP
SQLSTATE	HY000
Group	Server errors