That is the code for a problem. In most cases it is the yellow probe connection that caused the error. I would check your connections and if that does not fix it give cookshack a call and we can assist.
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .