no categories listed / flexicontent items can't be saved

Warning: Invalid argument supplied for foreach() in /cluster/testing/test.wegenenverkeer.be/htdocs/components/com_flexicontent/classes/flexicontent.categories.php on line 225

This is the message we get after installing the latest version of flexicontent.

Since no categories are listed, and it is compulsary the choose one, none of the flexcontent items can be saved.

Fixed apparently one of the plugins was not actived, even when it looked as if everything was actief. Desactiving and reactivating all flexi plugins was the easy fix