Go into each listing again, one by one. At the bottom you'll see the Error Check button, next to Save, Post, etc. If you click that it will tell you exactly what's wrong.
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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 .