After upgrading to MVC 5 I see exclamation mark for the web project, though it works

Created Dec 9, 2013 Edited Dec 9, 2013

Viewed 2311

I upgraded the project to MVC 5 and now experience the problem with "exclamation mark", though it works but it is annoying to see it in the VS 2012.

I mean this sign: enter image description here