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

ERRORTNS: needs PREFERRED_CMANAGERS entry in TNSNAV.ORA
CAUSETNSNAV.ORA does not have a PREFERRED_CMANAGERS defined.
ACTIONAdd a PREFERRED_CMANAGERS entry to the TNSNAV.ORA file.