Changed password exception for webservices to include an errorcode

externallib.php

@@ -35,7 +35,7 @@ class mod_vpl_webservice extends external_api {
             throw new Exception( get_string( 'opnotallowfromclient', VPL ) . ' ' . getremoteaddr() );
         }
         if (! $vpl->pass_password_check( $password )) {
-            throw new Exception( get_string( 'requiredpassword', VPL ) );
+            throw new moodle_exception('requiredpassword', VPL);
         }
         return $vpl;
     }