Why these "critical" errors ?

[Glus Xof <gtglus gmail com>]

Hello guys,

Why this kind of errors,

(pp:14491): GLib-GObject-CRITICAL **: g_param_spec_flags: assertion
`G_TYPE_IS_FLAGS (flags_type)' failed

(pp:14491): GLib-GObject-CRITICAL **: g_object_class_install_property:
assertion `G_IS_PARAM_SPEC (pspec)' failed

???

Could you describe them or pointing me a little documentation about ?

How could I work around or solve them ?

Google didn't help me.

Glus