Oracle Error Message
ORA-31676: illegal value for number of workers, string
Reason for the Error
Called create worker processes with an illegal number of workers specified.
Solution
Make sure that the number of workers value is greater than 0 and less than the maximum value for the platform (normally 32767). If this error occurs from a Data Pump client (e.g. expdp or impdp) and you specified the parallel parameter, try the operation again with a smaller value for the parallel parameter. If the error occurs again, contact Oracle Customer Support and report the error.