1. Go to your FTP
2. Go to src/XF/Admin/Controller
3. Open index.php
Find & Remove:
Code:
/** @var \XF\Repository\FileCheck $fileCheckRepo */
$fileCheckRepo = $this->repository('XF:FileCheck');
Find & Remove:
Code:
'legacyConfig' => file_exists($this->app->container('config.legacyFile')),
'fileChecks' => $fileCheckRepo->findFileChecksForList()->fetch(5),
You should rebuild your cache afterwards to prevent problems.