gsignal.c:2576: instance `0x1c45360' has no handler with id `536'

[jody <jody xha gmail com>]

Hi
I have a (rather complex) application which uses gtkmm.
Some time ago it started writing messages when i close it:

(NewGrid:15404): GLib-GObject-WARNING **: gsignal.c:2576: instance
`0x1c45360' has no handler with id `536'

(NewGrid:15404): GLib-GObject-WARNING **: gsignal.c:2576: instance
`0x1c45500' has no handler with id `538'

I have googled for this message, but didn't find a post which had
relevant information for my case.

What do these messages mean?
How can i fix this?

Thank You
  Jody