beyondcr@beyondcr:~$ gnome-screenshot

(gnome-screenshot:20620): Gtk-WARNING **: Theme parsing error: button.css:28:20: Invalid animation description

(gnome-screenshot:20620): Gtk-WARNING **: Theme parsing error: button.css:64:20: Invalid animation description

(gnome-screenshot:20620): Gtk-WARNING **: Theme parsing error: progressbar.css:5:20: Not using units is deprecated. Assuming 'px'.

(gnome-screenshot:20620): Gtk-WARNING **: Theme parsing error: progressbar.css:79:19: Not using units is deprecated. Assuming 'px'.

(gnome-screenshot:20620): Gtk-WARNING **: Theme parsing error: scale.css:6:20: Not using units is deprecated. Assuming 'px'.

(gnome-screenshot:20620): Gtk-WARNING **: Theme parsing error: scale.css:7:33: Not using units is deprecated. Assuming 'px'.

(gnome-screenshot:20620): Gtk-WARNING **: Theme parsing error: scale.css:166:19: Not using units is deprecated. Assuming 'px'.

(gnome-screenshot:20620): Gtk-WARNING **: Theme parsing error: scale.css:184:19: Not using units is deprecated. Assuming 'px'.

(gnome-screenshot:20620): Gtk-WARNING **: Theme parsing error: toolbar-dark.css:89:20: Invalid animation description

(gnome-screenshot:20620): Gtk-WARNING **: Theme parsing error: toolbar-dark.css:479:1: '/*' in comment block

(gnome-screenshot:20620): Gtk-WARNING **: Theme parsing error: toolbar-dark.css:534:20: Invalid animation description

** (gnome-screenshot:20620): WARNING **: Unable to use GNOME Shell's builtin screenshot interface, resorting to fallback X11. Error: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.Shell was not provided by any .service files