[gtkada] error messages from the C side

[jf Menon]

Hello,
I get this kind of error messages :

(main:31919): Gtk-CRITICAL **: file gtkwidget.c: line 6871 
(gtk_widget_get_clipboard): assertion `gtk_widget_has_screen (widget)' 
failed

(main:31919): Gtk-CRITICAL **: file gtkclipboard.c: line 575 
(gtk_clipboard_get_owner): assertion `clipboard != NULL' failed

How can I find where is the problem in my Ada code ?

thx
jf