I get this error repeatedly when developing ASP.Net applications:
Cannot create/shadow copy \'XXXXX\' when that file already exists
Where
If you use Entity Framework:
Error Message: "Cannot create/shadow copy '' when that file already exists."
Solution: "Wait a few seconds and refresh the page."
For more information please visit: Advanced Entity Framework 6 Scenarios for an MVC 5 Web Application (12 of 12)