I ran into a similiar issue - it actually started with the error you show above. I thought it was because of an ambiguous reference so I prefixed it with the MetaData (from "using MetaData = " statement above) and it stopped complaining
that it was missing a reference. I ended up doing this (painful) process throughout the entire application and in the end was greeted with 75 of the following errors:
Error 1 The type 'Microsoft.Windows.Design.Metadata.AttributeTableBuilder' exists in both 'c:\Program Files\Microsoft Visual Studio 9.0\Common7\IDE\PublicAssemblies\Microsoft.Windows.Design.dll' and 'c:\Program Files\Microsoft Expression\Blend
3\Microsoft.Windows.Design.Extensibility\Microsoft.Windows.Design.Extensibility.dll' C:\_Drive\Downloads\WPFToolkitBinariesAndSource\WPFToolkitBinariesAndSource\Toolkit-release\DataVisualization.Design\RangeAxisMetadata.cs 17 40 Controls.DataVisualization.Toolkit.VisualStudio.Design
I deleted everything and started over within the above context and I found that all of the projects will compile with the exception of
Controls.DataVisualization.Toolkit.VisualStudio.Design - I unloaded it and the solution successfully compiled. I reloaded the VisualStudio.Design project and found the following mismatch of references:
C:\Program Files\Microsoft Visual Studio 9.0\Common7\IDE\PublicAssemblies\Microsoft.Windows.Design.dll
c:\Program Files\Microsoft Expression\Blend 3\Microsoft.Windows.Design.Extensibility\Microsoft.Windows.Design.Extensibility.dll
I deleted the Microsoft.Windows.Design.Extensibility dll reference and replaced it with the following reference:
C:\Program Files\Microsoft Visual Studio 9.0\Common7\IDE\PublicAssemblies\Microsoft.Windows.Design.Extensibility.dll
And my solution compiles without errors or warnings.
Hope this helps your compile issues.