How to resolve this error in GTK File Chooser Dialog

Question

I have a button that will open a filechooser. But, I got this error:

(gui.py:9127): Gtk-CRITICAL **: gtk_widget_grab_default: assertion `gtk_widget_get_can_default (widget)' failed

(gui.py:9127): Gtk-CRITICAL **: _gtk_file_chooser_embed_initial_focus: assertion `GTK_IS_FILE_CHOOSER_EMBED (chooser_embed)' failed

This is my code:

from gi.repository import Gtk

def clicked(widget):
    response = filechooser.run()
    if response == Gtk.ResponseType.OK:
        print 'ok'
    else:
        print 'cancel'
        filechooser.destroy()

builder = Gtk.Builder()
builder.add_from_file('gui.glade')
filechooser = builder.get_object('filechooser1')
builder.get_object('button1').connect('clicked', clicked)
builder.get_object('window1').show_all()
Gtk.main()

Do you know why this happen?

One more question: I have a file chooser button. How to make this button not to change path to (None) when I click cancel if I already set path on it?

Answer 1

okay, I've got it. to resolve (gui.py:9127): Gtk-CRITICAL **: gtk_widget_grab_default: assertion 'gtk_widget_get_can_default (widget)' failed, you should change can default from Common Properties of your filechooser buttons to Yes.

and to resolve (gui.py:9127): Gtk-CRITICAL **: _gtk_file_chooser_embed_initial_focus: assertion 'GTK_IS_FILE_CHOOSER_EMBED (chooser_embed)' failed, you should change filechooser.destroy() to filechooser.hide()