XF 2.2 Exception: Could not find class

[Noumad]

Hello
Exception: Could not find class shqawe\IUTSP\XF\Pub\Controller\Forum when attempting to extend XF\Pub\Controller\Forum in src/XF/Extension.php at line 176

1. XF\Extension->extendClass() in src/XF/App.php at line 3004
2. XF\App->extendClass() in src/XF/App.php at line 1619
3. XF\App->XF\{closure}() in src/XF/Container.php at line 234
4. XF\Container->create() in src/XF/App.php at line 2959
5. XF\App->controller() in src/XF/Mvc/Dispatcher.php at line 291
6. XF\Mvc\Dispatcher->dispatchClass() in src/XF/Mvc/Dispatcher.php at line 259
7. XF\Mvc\Dispatcher->dispatchFromMatch() in src/XF/Mvc/Dispatcher.php at line 115
8. XF\Mvc\Dispatcher->dispatchLoop() in src/XF/Mvc/Dispatcher.php at line 57
9. XF\Mvc\Dispatcher->run() in src/XF/App.php at line 2483
10. XF\App->run() in src/XF.php at line 524
11. XF::runApp() in index.php at line 20