[Glade-users] GTK_IS_TREE_MODEL (model) failed

This is the second time I get the following message.

.../gladeHandlers.py:43: GtkWarning: gtk_tree_row_reference_new: 
assertion `GTK_IS_TREE_MODEL (model)' failed
  GladeHandlers.widgets = gtk.glade.XML("src/avNavUI.glade")

The first time I just diddled a signal handler and the message magically 
went away.  Not sure what I did; seems like some sort of crud was 
introduced into the Glade file, and I fortuitously touched something 
that made it self-correct.

Now, several weeks and many changes later I see a similar message 
again.  How can I determine what the problem is?


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