facebook to post with category forr imported posts

Hi, I'm trying to set up fbomatic and I can't get it running. I have a website which sorts posts by category. All posts should be classified with the category "facebook feed" when I hit "Run this rule now"  I get the red cross... ;-/ I've set up for each user/administrator of the site a seperate Post Author ID, is that necessary? There are more people posting within the group, all posts should show up with comments, but people should not have a like-button or be able to comment in Wordpress. your help is very much appreciated. I could set you up as an admin if this helps. best, Torsten