'Newtonsoft' type or namespace could not be found.. (Unity 5

hosupark

I would like to use the 'PUN' with 'UNITY 5'.
but I have a problem.

Under point, an error occurs.

PhotonNetwork/AccountService.cs
using Newtonsoft.Json;
error : 'Newtonsoft' type or namespace could not be found..

Newtonsoft.Json.dll are contained within PhotonNetwork folder.

Windows 7 64bit
Unity 5
PUN
VS2010 / .Net Framework 3.5

please help me..

hosupark

Cause was because I did not add the dll files in the project settings. T.T