Fatal error: Uncaught Error: Interface "League\Flysystem\FilesystemException" not found in /home/wwwarms/ws.arms-tools.com/websocket-server/vendor/league/flysystem/src/UnreadableFileEncountered.php:9 Stack trace: #0 {main} thrown in /home/wwwarms/ws.arms-tools.com/websocket-server/vendor/league/flysystem/src/UnreadableFileEncountered.php on line 9