Message Oracle ORA-39106 - Worker process string failed during startup. Worker error:

ERRORWorker process string failed during startup. Worker error:
CAUSEThe worker process whose name is listed failed during startup.
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.