I have all the latest module and version of Drupal. I configure webmail plus properly and I still have errors. I can't see the folders. I can't reply messages. I have errors.. A LOT! It's seems impossible to make it work. Does anyone succeeded to use without errors?

look at this one:

warning: Invalid argument supplied for foreach() in /druapl/modules/webmail_plus/webmail_plus.module on line 1872