Gtk-CRITICAL

woland@woland-desktop ~ $ sudo grub-customizer

(grub-customizer:13240): Gtk-CRITICAL **: gtk_css_section_get_file: assertion `section != NULL' failed

(grub-customizer:13240): Gtk-CRITICAL **: gtk_css_section_get_end_position: assertion `section != NULL' failed

(grub-customizer:13240): Gtk-CRITICAL **: gtk_css_section_get_end_line: assertion `section != NULL' failed

(grub-customizer:13240): Gtk-WARNING **: Theme parsing error: <data>:1:0: Unknown value 'GTK_SHADOW_NONE' for enum type 'GtkShadowType'
*** initializing (w/o specified bootloader type)…
* reading partition info…
* Loading Framebuffer resolutions (background process)
* Finding out if this is a live CD
*** initializing (w/ specified bootloader type)…
process 13255: arguments to dbus_move_error() were incorrect, assertion "(dest) == NULL || !dbus_error_is_set ((dest))" failed in file ../../dbus/dbus-errors.c line 282.
This is normally a bug in some application using the D-Bus library.
libhal.c 3483 : Error unsubscribing to signals, error=The name org.freedesktop.Hal was not provided by any .service files
* Checking if the config directory is clean
*** loading configuration
*** loading - preserveConfig: no
* unsetting saved config
*** loading settings
*** loading grub list
* loading scripts…
* loading proxies…
* cleaning up proxy configuration…
* creating proxifiedScript links & chmodding other files…
* running grub-mkconfig
* restoring grub configuration
* removing invalid proxies from list
* loading completed
*** grub list completely loaded
*** loading saved grub list

(grub-customizer:13240): Gtk-CRITICAL **: gtk_widget_get_style_context: assertion `GTK_IS_WIDGET (widget)' failed