IIS express: Cannot add duplicate collection entry of type 'add' with unique key attribute 'name' set to

Question

In Visual studio, Solution->Web.Project->Properties->Web, I have changed my Project Url from http://localhost:51123/ to http://localhost:51123/NewProj

Answer 1

I had the same problem, here's what I did:

• I changed my Server settings from Local IIS to IIS Express:

• If it still doesn't work, I changed the port number to different port number then click the Create Virtual Directory button. Clean the solution then Rebuild.