Error with MEF (editor classifier)

Hello everybody,

I'm developing an isolated shell application and I use coloring with MEF (editor classifier). In Visual Studio in debug mode it runs fantastic but when deploying there is no coloring at all.

I'm not sure but this error in ActivityLog.xml makes me suspect:

ERROR: Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information.
C:\PROGRAM FILES (X86)\MICROSOFT VISUAL STUDIO 12.0\COMMON7\IDE\COMMONEXTENSIONS\PLATFORM\TREENAVIGATION\GRAPHPROVIDER\Microsoft.VisualStudio.Shell.TreeNavigation.GraphProvider.dll

ERROR: Could not load file or assembly 'Microsoft.VisualStudio.GraphModel, Version=11.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.
C:\PROGRAM FILES (X86)\MICROSOFT VISUAL STUDIO 12.0\COMMON7\IDE\COMMONEXTENSIONS\PLATFORM\TREENAVIGATION\GRAPHPROVIDER\Microsoft.VisualStudio.Shell.TreeNavigation.GraphProvider.dll

Should I do any special check or is there any safe way of deploying a shell application with MEF? If MEF is not loading properly, if there is a reference problem, I'm a bit lost on how to fix this, I'm not very skilled with assemblies.

Please, help. Any clue, technique, way… I will be very grateful.