MySQL error code

MySQL error 1864

MySQL server error 1864 is ER_MTA_EVENT_BIGGER_PENDING_JOBS_SIZE_MAX, reported with SQLSTATE HY000.

Cannot schedule event %s, relay-log name %s, position %s to Worker thread because its size %lu exceeds %lu of replica_pending_jobs_size_max.

Error	1864
Name	ER_MTA_EVENT_BIGGER_PENDING_JOBS_SIZE_MAX
SQLSTATE	HY000
Group	Server errors