I can't access messages or facetime from my mac

I've been using messages and facetime on my macbook air for almost a year now. I am currently running OS X Mountain Lion 10.8.4. Recently I've had trouble getting onto facetime and messages from my mac. I have no problems getting on either from my iPad, but I can't seem to get on from my mac. When I try to login to messages or facetime, I get this message; "The registering device does not have appropriate credentials". I can still get on the app store from my mac, and everything else is working fine, I just can't get into messages or facetime. Does anybody know a way to fix this problem? Any help would be greatly appreciated, thanks!

Sign out of iMessage in the Accounts tab of the preferences dialog, then sign back in. If there's no change, log out of your user account, log back in, and try again.

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