Error loading users

Jan 8 at 4:22 PM
Edited Jan 8 at 4:50 PM
That's the message I get when I try to open Profiles or Users in the admin menu. When I log in with my normal username and password, my account is shown as "Anonymous".
I use version 3.2.0.

A different Blogengine 3.2.0 blog that I also use, does not show this error. I compared almost all files and ACL's in the App_Data folder but I cannot find the problem.
Any thoughts?
Jan 8 at 5:00 PM
Sometimes this happens when you have duplicate users, for example 2 blogs both have "admin".
Jan 8 at 5:04 PM
The second blog is on a different URL.
Jan 8 at 6:56 PM
Found the cause: wrong permissions on App_Data.