Post error after deploying on local IIS

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IIS7

IIS

Hey,

I've been stuck with this problem for almost a day now, so i figured I'll ask you guys. I'm developing a MVC3 application with jquery mobile. And it's been working just fine when I run it on my local dev server, but after I deployed it on my localhost, IIS7 I got got this error.

The site is running fine, until click a button that is doing a Jquery post to an actionresult in the controller.

$.post("/Games/PlayerAttendance", { gameId: parseInt(_gameId), status: parameter }, function (data) {
             $("#deltagare").html(data);
          });

The controller Action looks like this:

public ActionResult PlayerAttendance(int gameId, string status)
        {
            Attendance attendance = new Attendance();
            if (status == "yes")
            { attendance.Status = (int)AttendanceStatus.Spelar; }
            else if (status == "maybe")
            { attendance.Status = (int)AttendanceStatus.Kanske; }
            else
                attendance.Status = (int)AttendanceStatus.Nej;
            attendance.fk_gameId = gameId;
            attendance.fk_playerId = 1;
            
            attendance.Name = "jane doe";  
            
            
            repository.SetParticipationStatus(attendance); 
            var attendees = repository.FindAttendeesInGame(gameId);
            return PartialView("Attendees", attendees);
        }

This works just fine in asp.net dev state, but it doesnt work when deployed. Any idea what i'm doing wrong? I've set the request limit to unlimited.