Mountain Lion Message Not Working

I have messeage connected to all my apple products.  So does my wife.  But I cant send a messeage using Mnt Lion messeage to any of my contacts from my or to my mac book pro.  any ideas?

I have messeage connected to all my apple products.  So does my wife.  But I cant send a messeage using Mnt Lion messeage to any of my contacts from my or to my mac book pro.  any ideas?

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