Solution for-ORA-00034:cannot string in current PL/SQL session

REASON:

In a session if you disabled the COMMIT/ROLLBACK. In this scenario if you try to issue a COMMIT/ROLLBACK through any of the PL/SQL objects like(procedure, function, package).

SOLUTION:
If you enable the commit in current session it will get rectified
else
don issue the COMMIT/ROLLBACK in the current session.