ORA-12198: TNS:could not find path to destination

admin

ORA-12198: TNS:couldnot find path to destination
Cause: Could not navigate a path through Interchanges to thedestination. This
error occurs if an invalid community is in the address string, or the address
includes a protocol that is not available or the TNSNAV.ORA file does not havea
correct CMANAGER address specified or the Interchange is down.
Action: Assurethat Interchanges necessary to get to the desired destination are up
and have available capacity for an additional connection. Also check that the
correct community and protocol have been specified in the CMANAGER address
used.