The 'clr-namespace' URI refers to a namespace that is not included in the assembly

c# .net wpf xaml converter

Solution 1:

rebuild the solution and the error will go away.

Solution 2:

I just solved this by changing the target from x64 to x86. Apparently Visual Studio is 32bit process and it's unable to load 64bit assemblies, and if your assembly is targeting x64 platform and you adding some custom control visual studio is unable to load it and throws this message.

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