Visual Studio 2010: Metadata file ".../Debug/Graph.dll" could not be found

I took a solution developed in visual studio 2005 and attempted to build the solution in visual studio 2010 express. The files not being found are .dll files. The project is written in C#. I've seen a couple people with similar problems online, however I have yet to find any useful respo开发者_开发知识库nses. I had the suspicion it may have to do with the .Net framework, but I check the version on the new and old machine and found them to be the same. Anything that could point me in the right direction would be great, thanks.

This worked for me, but I am using VS 2013:

• Clean every project individually (right-click > Clean)
• Build every project individually (right-click > Build)
• Build the startup project (solution)

For some reason, cleaning the solution had a different effect than cleaning every project individually.