Oracle Message TNS-12209 - TNS: encountered uninitialized global

ERRORTNS: encountered uninitialized global
CAUSEApplication calling navigation routine has not properly configured the global variables. There are no TNSNAV.ORA files available, or they are defective.
ACTIONNot normally visible to the user. For further details, turn on tracing and reexecute the operation. If error persists, contact Worldwide Customer Support.