注册3D2011时最后一步把激活码输入 后出现There is a problem with the activation code that you entered

注册3D2011时最后一步把激活码输入 后出现There is a problem with the activation code that you entered
最后一步出现Registration-Activation Error (0015.111)
There is a problem with the activation code that you entered.Click one of the following links.
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Contact Autodesk
激活码是算出来的 ,来个具体的答案呗.