Visual Studio Grasshopper Debugger

Hi,
I have copied my VS project to another computer. Now, it gives me following error message:

Visual Studio cannot start debugging because the debug target ‘C:\Program Files\Rhinoceros 5.0\System\Rhino.exe’ is missing. Please build the project and retry, or set the OuputPath and AssemblyName properties approipriately to point at the correct location for the target assembly.

I’m using VS Express 2012 on both computers. If I open a new Grasshopper project with the wizard, then it’s working. However, I can’t figure out fixing the paths of the copied project.

Thanks a lot
Christoph