We get the above error message on our build server, when we build the solution or the specific project that the error refers to.
We can build the solution without any problem using visual studio (also on the build server), however it fails with the above error when running msbuild.
Any Ideas?
I found the solution.
There is a "bug" in msbuild, that results in it failing when there are not source files in the project. For example Filename.cs.
Our project only had xml and other file types.
Just added an empty cs file and it worked.
I also got this error message when "building" a project which didn't have any *.cs files...but we do that fairly often for SharePoint projects which are just XML. the VS project is just to organize some of the XML documents. Long story short the problem was that there was AssemblyInfo.cs file. After adding some assembly info to the project properties, voila! It worked. So I guess, yes, you need a .cs file to actually compile anything, but the AssemblyInfo.cs is enough.