thanks. ah you are saying i have to change the asp .net version? but there's no project that has been created, no .sln file or anything, as in no project at all. I can't open the existing files/projects, that i've created before, so no build/compilation, and i can't assign or create also a virtual directory for it. When i chose the New>Project>Business Intelligence Project>Report Server Project that error message comes out that leads to no creation of project at all.