Getting Exception in MVC web apps after installing VS2015

Hii;

Everyone i install VS2015 in my system and open my old project which i developed using VS2013Web after the project is opened

i make build for that project and when build is successful then i started running of my application ; at the time of running i am getting an exception

in my browser window is that :-

"Could not load file or assembly 'System.Web.Mvc' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)"

and i google this error but did not getting any valid solution and one thing more is that after this also when i opening that same project in VS2013Web their also getting same exception; but before the installation of VS2015 my project running well in VS2013Web.

So can anybody help me regarding this how to solve this issue.

Thanks in advance.