TNS-00143: Illegal PREFERRED_CMANAGERS entry in TNSNAV.ORA
Cause: PREFERRED_CMANAGERS entry in the TNSNAV.ORA used by the Connection Manager. There should only be a PREFERRED_NAVIGATORS entry in the TNSNAV.ORA on an Interchange.
Action: Remove the PREFERRED_CMANAGERS entry from TNSNAV.ORA and assure that either no PREFERRED_NAVIGATORS entry is present or that it is correct.