[MonoDevelop] Finding where an error occurs

[alan battersby]

Hi,
When running some code I'm developing I get the GTK error message shown
below.

(OTWorkbench:17173): Gtk-CRITICAL **: gtk_tree_store_get_value:
assertion `VALID_ITER (iter, tree_store)' failed

Stuff still seems to work but I want to remove the problem. So Is there
a way to relate the 17173 to a line number in one of my several classes
that use a tree store? If not what is the best way to find out where
this is occurring?

Thanks
Alan