vb.net compile error 'abc' is ambiguous in the namespace 'xyz'

Question

I have a VB.Net solution that another developer created and I\'m trying to compile it on our build machine (it compiles on their machine) but with one of the projects I get

Answer 1

Check your references if you have two versions of the same reference (eg. Microsoft.ReportViewer.Webforms version 10.0.0.0 and Microsoft.ReportViewer.Webforms 8.0.0.0) You will get this error. Delete the oldest and you should be good. I do this to myself all of the time.