Error: Undefined Variable $texter

The variable $texter is not defined inside the method, so PHP will throw an "Undefined variable" error.

Author: cadot-eu

notifier.rst

@@ -759,7 +759,7 @@ Now you can send notifications to your desktop as follows::
                 sprintf('%s is a new subscriber', $user->getFullName())
             );
 
-            $texter->send($message);
+            $this->texter->send($message);
         }
     }