Clicking on settings of the switch extension generates an error

[tukanos]

Running: GNOME Shell 3.38.6

The error:
The settings of extension switcher@landau.fi had an error:

TypeError: Gtk.StyleContext.add_provider_for_display is not a function

Stack trace:

buildPrefsWidget@/home/tukan/.local/share/gnome-shell/extensions/switcher@landau.fi/prefs.js:25:20
_init@resource:///org/gnome/Shell/Extensions/js/extensionsService.js:207:40
OpenExtensionPrefsAsync/<@resource:///org/gnome/Shell/Extensions/js/extensionsService.js:122:28
asyncCallback@resource:///org/gnome/gjs/modules/core/overrides/Gio.js:132:22
run@resource:///org/gnome/Shell/Extensions/js/dbusService.js:177:20
main@resource:///org/gnome/Shell/Extensions/js/main.js:19:13
run@resource:///org/gnome/gjs/modules/script/package.js:222:19
start@resource:///org/gnome/gjs/modules/script/package.js:206:8
@/usr/share/gnome-shell/org.gnome.Shell.Extensions:1:17