Claims problem when opening documents

Question

following this tutorial (http://blogs.technet.com/b/mahesm/archive/2010/04/07/configure-forms-based-authentication-fba-with-sharepoint-2010.aspx) I configured the claims for my web app... but something is wrong because i get a error page whenever i click a document in a library (liek to view or edit it)... here is the error screenshot

everything else is working just ok... this "feature" (people open files and alter without having to download and reupload later) is very critical for my project...

Answer 1

You state in the picture that the site collection at '/' doesn't even exitst.

It should otherwise you're running unsupported unless every site collection is a host header site collection in the web application. See SharePoint 2010: Supportability of unprovisioned root site in a SharePoint web application