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.

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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.