Issue: B6 upgrade step 8: Invalid model 'XenForo_Model_CodeEventListener' specified

Invalid model 'XenForo_Model_CodeEventListener' specified

    XenForo_Model::create() in XenForo/Model.php at line 113
    XenForo_Model->getModelFromCache() in vw/XenForo/Model.php at line 36
    vw_XenForo_Model::fetch() in /vault/core/controller/install/common/xf.php at line 376
    vw_Install_Common_Controller_XF->rebuild() in /vault/core/controller/install/upgradepath/vw.php at line 53
    {closure}() in /vault/core/controller/install/upgradepath/vw.php at line 71
    vw_Install_UpgradePath_Controller->call() in /vault/core/controller/cp/install/vw.php at line 270
    vw_CP_Install_Controller->exec_step() in/vault/core/controller/cp/install/vw.php at line 183
    vw_CP_Install_Controller->upgrade() in /vault/core/controller/cp/install/vw.php at line 69
    vw_CP_Install_Controller->execute() in vw/XenForo/ControllerAdmin/Wiki.php at line 94
    vw_XenForo_ControllerAdmin_Wiki->actionIndex() in vw/XenForo/ControllerAdmin/Wiki.php at line 123
    vw_XenForo_ControllerAdmin_Wiki->actionUpgrade() in XenForo/FrontController.php at line 337
    XenForo_FrontController->dispatch() in XenForo/FrontController.php at line 134
    XenForo_FrontController->run() in /admin.php at line 13