XF 1.5 Cannot Load Class Using XFCP? Any easy solution

[jasculs]

I know for sure that I have a plugin conflict with another add-on but was just wondering if anyone knew if this was an easy fix? I have programmers that I work with but I they won't be available for a couple days. I know how to edit files and look for places in code so if it's an easy fix I can probably just do it myself. Any help is much appreciated! Thanks1

An exception occurred: Cannot load class using XFCP. Load the class using the correct loader first. in /home/jasculs/public_html/portal/library/XenForo/Autoloader.php on line 108

1. XenForo_Autoloader->autoload()
2. spl_autoload_call() in ForumCube/ThreadFeaturedImage/Extend/XenForo/ControllerPublic/Attachment.php at line 4
3. include() in XenForo/Autoloader.php at line 119
4. XenForo_Autoloader->autoload() in XenForo/Application.php at line 1052
5. XenForo_Application::autoload() in XenForo/Application.php at line 529
6. XenForo_Application::resolveDynamicClass() in XenForo/FrontController.php at line 478
7. XenForo_FrontController->_getValidatedController() in XenForo/FrontController.php at line 361
8. XenForo_FrontController->dispatch() in XenForo/FrontController.php at line 152
9. XenForo_FrontController->run() in /home/jasculs/public_html/portal/index.php at line 13