cannot register existing type

i have 2 custom widgets: GtkMaskedEntry and GtkDateEntry

GtkDateEntry is a GtkBin with inside GtkMaskedEntry

i created catalogs and pixmaps to use them with glade (version  
3.14.3); but when i try to insert widget GtkDateEntry inside a  
container (ex. GtkBox) i got the error

GLib-GObject-WARNING **: cannot register existing type `GtkMaskedEntry'
(glade.exe:5052): GLib-CRITICAL **: g_once_init_leave: assertion  
`result != 0' failed
(glade.exe:5052): GLib-GObject-CRITICAL **: g_object_new: assertion  
`G_TYPE_IS_OBJECT (object_type)' failed

and glade crash (if i insert GtkMaskedEntry it works)

in glade 3.8.x they works perfectly

what could be the problem?

thanks in advance

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