Prob with ruby and gtk2 ( glade )

lo there all,
i am using the ruby gtk module to build a simple GUI app.
i also used glade and the create-template command to generate the
structure.

here is what i get in a terminal when i run it.

GLib-GObject-CRITICAL **:g_boxed_type_register_static: assertion
`g_type_from_name (name) == 0’ failed

now, the app still runs fine, but i don’t know what the above means.

thanks for any tips.

shawn