I got this error when i switched the default web server in visual studio to use IIS instead of visual studio integrated web server. To fix this error is by changing the IIS Default Web Site Properties in (Home Directory -> Local Path). Remove any “\” character at the end of the directory. IIS will automatically add one which causing double “//” at then end and it causes problem if you manually add one before. You can check Default Web Site Properties -> ASP.NET -> File Location for actual setting information
