Why can`t i use the iMessage app in my mac?

every time i try to sign in, it tells me that there is an error. i dont know why!!!
that happens as well with my facetime on my mac!!!

found this
I had the same problem, and found the solution in other thread:
"This worked for me: (make sure Facetime is closed)
1. In Spotlight type in "Keychain Access"
2. There will be a certificate issued by Apple iPhone Device CA - This certificate was signed by an unknown authority. Delete this certificate (or move it to the desktop, out of the keychain access store)
3. Launch Facetime and login - this time there will be no error..."
from: http://discussions.apple.com/thread.jspa?messageID=12561111
try that

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