有时候你会遇到这样的问题
Error6Thetag'CrystalReportsViewer'does notexistinXMLnamespace
'clr-
namespace:SAPBusinessObjects.WPF.Viewer;assembly=SAPBusinessObjects.WPF.Viewer'.
Line6Position10
在网上搜了一下，其解决方法为：
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.
就是将“项目”中“属性”框中的.NET Framework 4 Client Profile改为.NET Framework 4。
原文链接：https://www.f2er.com/xml/300466.html