I was getting an exception

An exception of type System.IO.FileNotFoundException occurred in Box.V2.dll but was not handled in user code

Additional information:

Could not load file or assembly 'System. Runtime, Version=4.0.10.0, Culture=neutral, Public Key Token=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.

This exception occurred when i was creating a client using the Box Client class. the following is the code

I also updated the box.V2.sdk from git and also tried reinstalling this api in the nugget packages in visual studio 2015 but still this exceptio occurs.The following is the peice of code is below

var config = new BoxConfig(BoxClientId, BoxSecret, new Uri("http://localhost"));

var session = new OAuthSession(access_token, refresh_token, 3600, "bearer");

client = new BoxClient(config, session);

Can anyone please suggest me a solution