Failed to map the path '/'. .net 4.0

Question

I have a .net app that I just opened on in visual studio 2010 and converted to 4.0 when it asked me on start-up. I go to try to build the site, and I get this error:

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Answer 1

I know it's and old question, but for the record if you are running against IIS then

'iisreset' in the console may help resolving "Failed to map the path '/'." issue. I had this problem after renaming the sites in IIS.