Problema en XenForo

estoy usando XenForo 2.1.4 y tengo este problema: src/XF/Data/Emoji.php en principio no había notado nada pero hoy he intentado poner emoticonos en un post y me sale el siguiente error:

LogicException: **Class XF\Data\Emoji does not exist in src/XF/Container.php at line 267**
XF\Container->createObject() in src/XF/App.php at line 1589
XF\App->XF\{closure}() in src/XF/Container.php at line 228
XF\Container->create() in src/XF/App.php at line 2780
XF\App->data() in src/XF/Mvc/Controller.php at line 821
XF\Mvc\Controller->data() in src/XF/Pub/Controller/Editor.php at line 112
XF\Pub\Controller\Editor->actionSmiliesEmoji() in src/XF/Mvc/Dispatcher.php at line 321
XF\Mvc\Dispatcher->dispatchClass() in src/XF/Mvc/Dispatcher.php at line 244
XF\Mvc\Dispatcher->dispatchFromMatch() in src/XF/Mvc/Dispatcher.php at line 100
XF\Mvc\Dispatcher->dispatchLoop() in src/XF/Mvc/Dispatcher.php at line 50
XF\Mvc\Dispatcher->run() in src/XF/App.php at line 2178
XF\App->run() in src/XF.php at line 390
XF::runApp() in index.php at line 20

Si alguien puede ayudarme se lo agradeceria. Gracias