Imessage won't work on my mac

Everytime I try to sign in to Imessage it say it doesn't have the appropiate credidentials. It use to work. I don't know what has happened. Can anyone help me with this?
Thanks so much

Hello Dzgirl97,
I would recommend looking through the following article for information and troubleshooting steps that can help get you signed into Messages.
FaceTime, Game Center, Messages: Troubleshooting sign in issues
http://support.apple.com/kb/TS3970
Cheers,
Allen

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