You posted in the wrong section of the Forums. Your thread is a PlayStation Network Support issue, http://community.us.playstation.com/t5/PlayStation-Network-Support/bd-p/22039, and not a Home releated topic.
If you have a disc in your system, remove the disc from the PS3, sign out and sign back in. (Worked for me)
Other methods are.
Change/delete your comment, sign out and back in.
Sign out/back in.
Wait for a few hours/minutes.
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