Compilation with VS SDK 1.1 does not work


Hi everyone.
I tried to compile the latest snapshot 11712, which was downloaded from codeplex.
I noticed that I need to download and install the vs sdk as a prerequisite.
When I open the project now, I get a error message telling me:
Unable to read the project file 'phpProject.csproj' S:\work\vs_php4vs-11712\phpProject\phpProject.csproj(177,11): The imported project "C:\Program Files\Microsoft Visual Studio 2008 SDK\VisualStudioIntegration\Common\Source\CSharp\Project\ProjectBase.Files" was not found. Confirm that the path in the <Import> declaration is correct, and that the file exists on disk.
I manualy copied this message so I hope i did not make any inching errors.
However, I searched this the directory for "ProjectBase.Files" and found nothing, there even isn't any directory named Project inside of the CSharp directory.
I tried to remove the stated line, and now get this error:
The source control provider assosiated with this solution could not be found. The projects will be treated as not under source control. Do you want to permanently remove the source control bindings from this project?
But at least the project loads now.
Any help?
Greets Louis.