Expression Blend: Getting error “XXX” does not exist in the namespace “XXX”, but not in VS2008

Question

I am trying to use Blend 3.0 to edit a project that contains some WPF controls. This project already compiles and runs fine from Visual Studio 2008.

In Blend however

Answer 1

You can also fix this "Any CPU/x86" issue by changing the output path for all your projects to bin\Debug instead of bin\x86\Debug (same for Release).