Oracle Message ORA-00392 - log string of thread string is being cleared, operation not allowed

ERRORlog string of thread string is being cleared, operation not allowed
CAUSEAn operation encountered this online log in the middle of being cleared. The command that began the clearing may have terminated without completing the clearing.
ACTIONIf the clear command is still executing then wait for its completion. If it terminated then reissue the clear command, or drop the log.