8404 Invalid Session ID…
This problem comes when TaminoClient object’s startSession{} method is called but because of some exception or some other reason endSession() could not be executed… In such a case this error is given till session expries, whenever you try to create a new session… so, best way to keep yourself away from this problem is keep .endSession in finally block or outside the try&catch block… Take care if you execute endSession on non-existent session, that inturn generates exception.