I recently upgraded my VS2005 projects to VS2008, I can compile all of my projects using the VS2008 IDE and they all compile w/o any errors. However when run DevEnv from the command line to build my projects the first line of the output file is Package 'Microsoft.VisualStudio.TeamFoundation.VersionControl.HatPackage, Microsoft.VisualStudio.TeamFoundation.VersionControl, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' failed to load. after that the output file looks correct, in that it shows what appears in the output window of the IDE when I compile the project. Also my project does compile. So how do I fix this error? thanks John.