Message Oracle TNS-12215 - TNS: poorly formed PREFERRED_NAVIGATORS Addresses in TNSNAV.ORA

ERRORTNS: poorly formed PREFERRED_NAVIGATORS Addresses in TNSNAV.ORA
CAUSEAddress binding for PREFERRED_NAVIGATORS entry is improperly entered. entry.
ACTIONCheck your PREFERRED_NAVIGATORS entry and fix it in TNSNAV.ORA