Interpretation of gtk warnings and errors messages

[Sergei Kolomeeyets <kolomeeyets gmail com>]

Hi everyone!
Can anybody be so kind to help me with sources (docs of web) with relevant
information or any ideas concerning interpretation of gtk messages like
this:
(main_1:31671): Gtk-WARNING **:
/build/buildd-gtk+2.0_2.24.10-2-i386-Tg7Q_2/gtk+2.0-2.24.10/gtk/gtkwidget.c:5683:
widget not within a GtkWindow.

It's obvious that 5683 is a line in the source file. It was easy to check,
but comments in that file tell almost noting as usual. What about
(main_1:31671)? How can I understand what is it and where is it? Definitely
it is not the line in the source file main_1.c and it is not the line in
main_1.o

Thanks!

Sergey,
Moscow.