use correct variable: $folder instead of $folderId
[tine20] / tine20 / Felamimail /
drwxr-xr-x   ..
drwxr-xr-x - Acl
drwxr-xr-x - Backend
-rw-r--r-- 4894 Config.php
-rw-r--r-- 2050 Controller.php
drwxr-xr-x - Controller
-rw-r--r-- 441 Exception.php
drwxr-xr-x - Exception
-rw-r--r-- 3169 Felamimail.jsb2
drwxr-xr-x - Frontend
drwxr-xr-x - HTMLPurifier
-rw-r--r-- 10369 Message.php
drwxr-xr-x - Model
-rw-r--r-- 7390 Preference.php
drwxr-xr-x - Protocol
-rw-r--r-- 620 Session.php
drwxr-xr-x - Setup
drwxr-xr-x - Sieve
-rw-r--r-- 4452 Transport.php
drwxr-xr-x - css
drwxr-xr-x - js
drwxr-xr-x - translations