XF 1.5 Server Error - Invalid model 'XenForo_Model_ThreadWatch' specified

[Shaun_g]

Users on our forum are currently unable to post and receive the following error:

Server Error
Invalid model 'XenForo_Model_ThreadWatch' specified
XenForo_Model::create() in XenForo/Controller.php at line 101
XenForo_Controller->getModelFromCache() in XenForo/ControllerPublic/Forum.php at line 1192
XenForo_ControllerPublic_Forum->_getThreadWatchModel() in XenForo/ControllerPublic/Forum.php at line 643
XenForo_ControllerPublic_Forum->actionCreateThread() in Andy/SimilarThreads/ControllerPublic/Forum.php at line 13
Andy_SimilarThreads_ControllerPublic_Forum->actionCreateThread() in XenForo/FrontController.php at line 351
XenForo_FrontController->dispatch() in XenForo/FrontController.php at line 134
XenForo_FrontController->run() in /home/hifiheadphonesco/public_html/community/index.php at line 13

Any idea where to start looking?

Thanks

 

[Mike]

The first thing to look at is the file health check. I suspect one or more files haven't been uploaded correctly.