Message Oracle ORA-39108 - Worker process string violated startup protocol. Worker error:

ERRORWorker process string violated startup protocol. Worker error:
CAUSEThe worker process whose name is listed started up but then exited before notifying the creating process that it was finished with initialization.
ACTIONRefer to any following error messages for possible actions. Also, check the trace log for the failed process, if one was created, to see if there is any additional information about the failure. Correct the error, if possible, and try the operation again. If the error occurs again, contact Oracle Customer Support and report the error.