Error adding/editing configuration

Adding a new configuration I get the following error:

warning: Invalid argument supplied for foreach() in C:\Entwicklung\acquia-drupal-site\acquia-drupal\includes\form.inc on line 1423.

this messages appear 3 times adding a configuration
The message comes after I switched on the Media Mover Node Module
Maybe something with languages? have switched on 3 languages but in the configuration there is no selection it is empty

Drupal 6.13