Why Gtk examples run under one language but not other

I have installed Csharp and Gtk (both 2 and 3) in Debian Stable Linux and I am trying to run a gtk example code file present in folder /usr/share/gtk-sharp2-examples/ . This simple file contains:...

Glade detects wrong version of Gtk+

I have a program (written by someone else) that I am trying to run. Traceback (most recent call last): File "gui/gui.py", line 387, in <module> gui = GUI(filepath=filename) ...