Unrecognized attribute 'targetFramework'. Note that attribute names are case

可能原因：.net4.0

32位的Windows：

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1. 运行->cmd 

2. cd  C:\Windows\Microsoft.NET\Framework\v4.0.30319

3. aspnet_regiis.exe -i

64位的Windows：

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1. 运行->cmd 

2. cd  C:\Windows\Microsoft.NET\Framework64\v4.0.30319

3. aspnet_regiis.exe -i