Problem with Simple Blog tutorial

After creating a prototype based on the simple blog tutorial, i get an error when trying to perform an action as a test user. It says, "You are unauthorized to perform this action". The strange thing is that it allows me to perform the action as an admin. Any ideas whats causing the problem?

Beginning Developers

Beginning Developers

This space is for newcomers, who wish to build a new plugin or to customize an existing one to their liking