Failed to map the path '/'. Problem with VS 2012 ASP.Net rdlc reports page

We have this problem in VS 2012 when running on Window 7.
Try running visual studio environment as administrator, then you wont get this error.
process:

1. Right-click the application, and then click Properties.
2. Click the Compatibility tab.
3. Select the Run this program as an administrator checkbox, and then click OK.