Cannot specify path AIML for Chat Bot in .Net Web API

I am developing a Chat Bot web application. I want to integrate AIML to make my web application friendly. I have a problem when I load file setting and load file AIML. My code

           var mybot = new Bot();
            mybot.loadSettings(@"C:\Users\user\Desktop\WorkSpace Temp\Test\WebApplicationAIML\WebApplicationAIML\bin\config\Settings.xml");
            mybot.isAcceptingUserInput = false;
            mybot.loadAIMLFromFiles();
            mybot.isAcceptingUserInput = true;
            var myUser = new User("DefaultUser", mybot);

            Request Question = new Request("Hi", myUser, mybot);
            Result Answer = mybot.Chat(Question);
            Console.WriteLine(Answer.Output);

But I got an error: "{"Value cannot be null.\r\nParameter name: path2"" at mybot.loadSettings(@"C:\Users\user\Desktop\WorkSpace Temp\Test\WebApplicationAIML\WebApplicationAIML\bin\config\Settings.xml"); I also try another way such as

mybot.loadSettings();

And include both aiml and config folder into Project, and coppy them into /bin/debug/ But I also got the same error. I use AIML 2.0 from http://ift.tt/2vHPnXQ

Please help me. Thank a lot.