Oracle Message ORA-06622 - LU6.2 Driver: Unable to attach to SNA

ERRORLU6.2 Driver: Unable to attach to SNA
CAUSEThe SQL*Net LU6.2 driver could not attach to the SNA software on your machine. The most likely cause is that the SNA software is not operational.
ACTIONCheck the status of the SNA software, ensure that it is operational and then try again.