Error: "The element <WFCompilationResourcesWithNoCulture> beneath element <ItemGroup> is unrecognized..."

When you try to compile a workflow project (WWF) you got an error like this one: Error 1 The element <WFCompilationResourcesWithNoCulture> beneath element <ItemGroup> is unrecognized.

Solution:

Open the project's file (.csproj) using the Notepad and change the framework version from 3.5 to 3.0, it must look as shown below:

  <Import Project="$(MSBuildExtensionsPath)\Microsoft\Windows Workflow Foundation\v3.0\Workflow.Targets" />