Please send us WordPress dashboard access privately thru the contact form which is on the right side at http://themeforest.net/user/muffingroup#contact and we will check what might be the reason.
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this message could mean that your license key is used on more than one domain or the current theme is not registered at all.
Please use this tool to manage your license keys:
http://forum.muffingroup.com/betheme/discussion/36219/cannot-register-deregister-your-license-key-use-this-tool#latest
thanks
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Thanks