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ASP.NET MVC–CS0234: The type or namespace name ‘’ does not exist in the namespace ‘System.Web.Mvc’

Sometimes you have these issues that always appear randomly. You know you have seen these issues before, but you can’t remember how you fixed them Verwarde emoticon.

Today I opened up the project I was working on for the last month to see the following error:

CS0234: The type or namespace name ‘’ does not exist in the namespace ‘System.Web.Mvc’

image

I first tried all the obvious things when you have such an unexpected error:

  • Clean the solution and rebuild the project… Didn’t help
  • Restarting Visual Studio… Didn’t help
  • Delete everything from the Temporary ASP.NET Files folder… Didn’t help
  • Got another coffee at the coffee corner… Didn’t help but I felt a little bit better

Finally I noticed that I had switched between configuration modes. Inside the Debug configuration mode, I noticed that Copy Local was set to False for System.Web.MVC. When I changed Copy Local to True everything was working again.

Wasted one hour…

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