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Xaml internal error WMC9999: An item with the same key has already been added

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    Hi all:

    After I use the optional "Retarget to windows 8.1" to update my app for windows 8.1,I found I can't build my project and I got that message:

    C:\Program Files (x86)\MSBuild\Microsoft\WindowsXaml\v12.0\8.1\Microsoft.Windows.UI.Xaml.Common.targets(327,9): Xaml internal  error WMC9999:An item with the same key has already been added.

    My Visual Studio version is 2013 update 2.

    How could I resolve this problem ?

    I am very worried!

    thx!

    别紧张，我不是什么好人。。。

    Wednesday, August 20, 2014 10:41 AM

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