Error 6 The tag 'CrystalReportsViewer' does not exist in XML namespace 'clr
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??有时候你会遇到这样的问题
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Error?6?????The?tag?'CrystalReportsViewer'?does not?exist?in?XML?namespace?'clr-namespace:SAPBusinessObjects.WPF.Viewer;assembly=SAPBusinessObjects.WPF.Viewer'. Line?6?Position?10
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? ? ? 在网上搜了一下，其解决方法为：
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? ? ? ? To resolve this error you need to go to the properties of the project and set the Target Framework to .NET Framework 4 not the .NET Framework 4 Client Profile. I'm not sure if this is a bug in the Beta version so hopefully you won't have to do this when the production copy is released.
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? ? ? ? 就是将“项目”中“属性”框中的.NET Framework 4 Client Profile改为?.NET Framework 4。
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原文来自：http://aspalliance.com/1991_Using_the_New_WPF_Viewer_with_SAP_Crystal_Reports_for_Visual_Studio_2010.2
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