I followed the steps outlined here in the tutorial http://www.opentk.com/doc/chapter/0, and then tried the more expansive setup.
However, I can not run any code with (I think) OpenGL.
The example browser program loads fine and I can run the Open AL examples fine, but any example under the headings OpenGL, OpenGLES, and OpenTK result in this error:
Unhandled Exception: System.NullReferenceException: Object reference not set to an instance of an object
at OpenTK.Graphics.GraphcisMode.get_Default () [0x00000] in <filename unknown> : 0
at Examples.Tutorial.Picking..ctor () [0x000000] in <filename uknown> : 0
at Examples.Tutorial.Picking.Main () [0x000000] in <filename uknown> : 0
at (Wrapper managed to Native) System.Reflection.MonoMethod:Internalinvoke (System.Reflection.MonoMethod.object.object[].System.Exception&)
at System.Reflection.MonoMethod.Invoke (System.object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.object[] parameters, System.Globalization.Cultureinfo culture) [0x000000] in <filename uknown> : 0
Also, if I run the game example provided in the download I get the same error, (System.NullReferenceException) but with different details.
This is on Linux, Ubuntu 12.04 and Mono 2.10. I've never understood exactly how OpenGL works on Linux as there always seems to be another package that deals with openGL in some way that I'd never heard of before, but I've got lots and lots of packages dealing with the thing, and added as many dev packages as I could find. glxgears works fine, and glxinfo reports my version as 1.4, so it seems like opengl works on my system to my inexpert eye. I was also able to successfully compile and run this OpenGL sample. http://open.gl/context#SFML
So how do I go about troubleshooting this? I presume it is some sort of interface between Mono and OpenGL, but I don't see anything I missed in the tutorial.
