Error message: Uncaught Error: Call to undefined function token_get_all()

I’ve been using Ultimate Member for about 3 years without incident. Today, I could not login to admin panel, instead received a PHP error message. Then WordPress sent me an email that my site was experiencing a technical issue, gave me a recovery mode link and the information copied below.

I’m the simpleton that WordPress is supposed to appeal to without real programming savvy. I clicked the recovery mode link and was able to access WordPress admin/dashboard. On the plugin page, it said “This plugin failed to load prperly and is paused during recovery mode”. I deactivated the plugin, exited recovery mode and everything (except Ultimate Member, of course) is working properly. I tried to activate Ultimate Member and the same thing happened again.

Can anyone help me know what to do next?

Here is the error message:

When seeking help with this issue, you may be asked for some of the
following information:
WordPress version 5.9.1
Current theme: Customizr Child (version 1.0.0)
Current plugin: Ultimate Member (version 2.3.1)
PHP version 7.4.28

Error Details
=============
An error of type E_ERROR was caused in line 963 of the file
/home/myncma/www/wp-content/plugins/ultimate-member/includes/core/class-shortcodes.php.
Error message: Uncaught Error: Call to undefined function
token_get_all() in
/home/myncma/www/wp-content/plugins/ultimate-member/includes/core/class-shortcodes.php:963
Stack trace:
#0 /home/myncma/www/wp-content/plugins/ultimate-member/includes/admin/core/class-admin-settings.php(1337):
um\core\Shortcodes->get_templates()
#1 /home/myncma/www/wp-includes/class-wp-hook.php(307):
um\admin\core\Admin_Settings->init_variables()
#2 /home/myncma/www/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters()
#3 /home/myncma/www/wp-includes/plugin.php(474): WP_Hook->do_action()
#4 /home/myncma/www/wp-admin/admin.php(175): do_action()
#5 /home/myncma/www/wp-admin/plugins.php(10): require_once(‘/home/myncma/ww…’)
#6 {main}
thrown`