I tried that but here the code

 Graphics g = this.CreateGraphics();
       Pen pen = new Pen(Color.Black, 10);
       g.DrawLine(pen, new Point(100, 0), new Point(100, 300));
       g.DrawLine(pen, new Point(200, 0), new Point(200, 300));
       g.DrawLine(pen, new Point(0, 100), new Point(300, 100));
       g.DrawLine(pen, new Point(0, 200), new Point(300, 200));  

Is it something I'm forgetting then?

Kilorn, thank you very much I really appreciate it. Your last post worked for me but I don't understand why though. Thanks everyone for your time and effort.

Yes it says it is on compile and its full name is 'menufont.spritefont' but could the path be wrong? the path is C:\Users\Owner\Desktop\c#\ScreenManager\ScreenManager\ScreenManagerContent\menufont.spritefont

Ok heres the picture of my solution explorer

It actually says the same warning.