I am sorry, I have uninstalled the plugin, due to time limitation put on me by my boss I had to find an alternate solution.
So unfortunatly I cannot help with this at this point.
I have the same problem. Everything was going fine, but posts were not showing up on my Fan Page wall. I am only trying to use the plugin to post to a Fan Page wall not my profile wall.
I’ve added the application only to the fanpage.
I followed all steps and got it working so that all posts showed up on the application page and the application “box” on the left in my fan page. But when I tried some more fiddling to make it post to the wall of the Fan Page and activated “Show errors posting to Facebook Stream” to troubleshoot I got this error too, requires user session.
I think a tutorial is needed, or expand the current tutorial with steps to puplish to wall (fan page or personal). Because googling the issue seems more people are having problems.
Thanks for a great plugin though, hope I can solve this ! 🙂
edit:
some more info, checking the rights with the link in WPBook settings shows my page have been granted stream rights.
I am using WP 2.9.2 and WPBook 1.5.5
