OPEN Help me Xenforo 2.1.1

[TimtimWinslow]

i gave me this errors

ParseError: syntax error, unexpected 'Fn' (T_FN), expecting identifier (T_STRING) in src/XF/Template/Compiler/Fn/EmptyFn.php at line 3

1. Composer\Autoload\includeFile() in src/vendor/composer/ClassLoader.php at line 322
2. Composer\Autoload\ClassLoader->loadClass()
3. spl_autoload_call() in src/XF/Template/Compiler.php at line 609
4. XF\Template\Compiler->setFunction() in src/XF/Template/Compiler.php at line 596
5. XF\Template\Compiler->setFunctions() in src/XF/Template/Compiler.php at line 589
6. XF\Template\Compiler->setDefaultFunctions() in src/XF/Template/Compiler.php at line 143
7. XF\Template\Compiler->__construct() in src/XF/App.php at line 1291
8. XF\App->XF\{closure}() in src/XF/Container.php at line 28
9. XF\Container->offsetGet() in src/XF/App.php at line 2969
10. XF\App->templateCompiler() in src/XF/Entity/Template.php at line 180
11. XF\Entity\Template->validateTemplateText() in src/XF/Entity/Template.php at line 166
12. XF\Entity\Template->verifyTemplate() in src/XF/Mvc/Entity/Entity.php at line 768
13. XF\Mvc\Entity\Entity->_verifyValueCustom() in src/XF/Mvc/Entity/Entity.php at line 613
14. XF\Mvc\Entity\Entity->set() in src/XF/Mvc/Entity/Entity.php at line 548
15. XF\Mvc\Entity\Entity->__set() in src/XF/AddOn/DataType/BbCodeMediaSite.php at line 81
16. XF\AddOn\DataType\BbCodeMediaSite->importAddOnData() in src/XF/Job/AddOnData.php at line 106
17. XF\Job\AddOnData->run() in src/XF/Job/Atomic.php at line 38
18. XF\Job\Atomic->run() in src/XF/Job/Manager.php at line 253
19. XF\Job\Manager->runJobInternal() in src/XF/Job/Manager.php at line 195
20. XF\Job\Manager->runJobEntry() in src/XF/Job/Manager.php at line 146
21. XF\Job\Manager->runUnique() in src/XF/Install/Controller/AbstractController.php at line 24
22. XF\Install\Controller\AbstractController->manualJobRunner() in src/XF/Install/Controller/Install.php at line 198
23. XF\Install\Controller\Install->actionRunJob() in src/XF/Mvc/Dispatcher.php at line 321
24. XF\Mvc\Dispatcher->dispatchClass() in src/XF/Mvc/Dispatcher.php at line 244
25. XF\Mvc\Dispatcher->dispatchFromMatch() in src/XF/Mvc/Dispatcher.php at line 100
26. XF\Mvc\Dispatcher->dispatchLoop() in src/XF/Mvc/Dispatcher.php at line 50
27. XF\Mvc\Dispatcher->run() in src/XF/App.php at line 2177
28. XF\App->run() in src/XF.php at line 390
29. XF::runApp() in install/index.php at line 14