Undefined constant "MESSAGE_DEFAULT_ENABLED"

[leonstr]

Installing this plugin with Moodle 3.11 fails with:

Exception - Undefined constant "MESSAGE_DEFAULT_ENABLED"

More information about this error
Debug info:
Error code: generalexceptionmessage
Stack trace:

    line 30 of /mod/googlemeet/db/messages.php: Error thrown
    line 708 of /lib/messagelib.php: call to require()
    line 421 of /lib/messagelib.php: call to message_get_providers_from_file()
    line 863 of /lib/upgradelib.php: call to message_update_providers()
    line 576 of /lib/upgradelib.php: call to upgrade_plugins_modules()
    line 1929 of /lib/upgradelib.php: call to upgrade_plugins()
    line 713 of /admin/index.php: call to upgrade_noncore()