Oracle Message ORA-12810 - PARALLEL_MAX_SERVERS must be less than or equal to string

ERRORPARALLEL_MAX_SERVERS must be less than or equal to string
CAUSEAn attempt was made to set the PARALLEL_MAX_SERVERS parameter to a value higher than the maximum allowed by the system.
ACTIONSet PARALLEL_MAX_SERVERS to a value less than or equal to the maximum specified in the accompanying message and retry.