[Gtk-sharp-list] `widget->parent == NULL' failed

[Vladimir Vukicevic]

Hi,

As Black Fox said, it's most likely a bug in your code; to figure out
what's causing it, run the program under gdb (run gdb on the mono
binary, and do "r yourapp.exe"), and set a breakpoint on g_log. 
That'll stop you at the point where that warning gets printed, and you
can examine the call stack and see what's going on; you won't be able
to see into the managed code, but the gtk trace should give you a
clue.

    - Vladimir