Oracle Solution for Error ora-12211

Solution for Oracle Error ORA-12211

ORA-12211: TNS:needs PREFERRED_CMANAGERS entry in TNSNAV.ORA

What triggered the Error:

TNSNAV.ORA does not have a PREFERRED_CMANAGERS defined.

What should we do to fix it:

Add a PREFERRED_CMANAGERS entry to the TNSNAV.ORA file.