I'm guessing if you check the editor log in the same folder, you'll see something like "OGL: 1.1.0", which means that windows is using openGL version 1, which lacks certain shader functions. The editor may need to be recompiled with a newer version of OpenTK/SDL.
Sorry I can't be more specific, writing this from my phone.
EDIT: Alright, home now, so I can elaborate a bit. I have the same problem with the editor, and you should see two distinct lines in your error log assuming it's the same problem:
OGL: 1.1.0
and
Resource error: : Unable to find an entry point named 'glCreateShader' in DLL 'opengl32.dll'.
The first line is stating that Windows is only providing the editor with extensions for OpenGL version 1.1.0, which is usually caused by outdated graphics drivers or incompatible graphics chips. The second line is confirming that fact by stating that the opengl32.dll (OpenGL for Windows) does not contain a method named glCreateShader. This is because glCreateShader is an OpenGL 2.X and newer method, and is not included in 1.1.0, which is the basic version provided by Windows. The usual response to this is to update your graphics drivers, however that isn't always going to fix it. The problem actually lies in the editor itself, or rather, in OpenTK, which the editor uses. In certain situations where OpenGL functions are called before the context is fully initialized, OpenTK will fail to completely load the extensions. The fix for this is a common one: Add a call to Gl.ReloadFunctions(); in the editor, which should fix it.
I've seen this same problem with two other apps, and one map editor a friend of mine worked on. This fixed the issue in all cases. This is something the devs will have to do.