[dvd::rip] error on pressing 'cluster' menu

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hi....I use dvdrip 0.97.12 on fedora core 5. When I click 
on 'cluster' menu , dvdrip is closed and I have in the 
shell this error:

Gtk-CRITICAL **: gtk_widget_get_pango_context: assertion 
`GTK_IS_WIDGET (widget)' failed at 
/usr/lib/perl5/site_perl/5.8.8/Video/DVDRip/GUI/Main.pm 
line 165.
Pango-CRITICAL **: pango_context_get_language: assertion 
`context != NULL' failed at 
/usr/lib/perl5/site_perl/5.8.8/Video/DVDRip/GUI/Main.pm 
line 165.
Segmentation fault

what is it?