Critical error caused by frontend form

I had some rogue custom settings and tabs when I looked into my fields, which Ive now stripped all of. So now no obvious 'critical error'. But still the form is not showing, not even with [mb_frontend_form id='research-summary' post_fields='title'] and I am still getting the following errors:

[11-Aug-2023 10:49:46 UTC] PHP Fatal error: Uncaught Error: Call to undefined function get_current_screen() in /public_html/wp-admin/includes/template.php:1481

 * @param string                 $id      Meta box ID (used in the 'id' attribute for the meta box).
 * @param string|array|WP_Screen $screen  The screen or screens on which the meta box is shown (such as a
 *                                        post type, 'link', or 'comment'). Accepts a single screen ID,
 *                                        WP_Screen object, or array of screen IDs.
 * @param string                 $context The context within the screen where the box is set to display.
 *                                        Contexts vary from screen to screen. Post edit screen contexts
 *                                        include 'normal', 'side', and 'advanced'. Comments screen contexts
 *                                        include 'normal' and 'side'. Menus meta boxes (accordion sections)
 *                                        all use the 'side' context.
 */
function remove_meta_box( $id, $screen, $context ) {
	global $wp_meta_boxes;

	if ( empty( $screen ) ) {
		$screen = get_current_screen(); // This is line 1481
	} elseif ( is_string( $screen ) ) {
		$screen = convert_to_screen( $screen );
	} elseif ( is_array( $screen ) ) {
		foreach ( $screen as $single_screen ) {
			remove_meta_box( $id, $single_screen, $context );
		}
	}

	if ( ! isset( $screen->id ) ) {
		return;
	}

	$page = $screen->id;

	if ( ! isset( $wp_meta_boxes ) ) {
		$wp_meta_boxes = array();
	}
	if ( ! isset( $wp_meta_boxes[ $page ] ) ) {
		$wp_meta_boxes[ $page ] = array();
	}
	if ( ! isset( $wp_meta_boxes[ $page ][ $context ] ) ) {
		$wp_meta_boxes[ $page ][ $context ] = array();
	}

	foreach ( array( 'high', 'core', 'default', 'low' ) as $priority ) {
		$wp_meta_boxes[ $page ][ $context ][ $priority ][ $id ] = false;
	}
}

Stack trace:
#0 /public_html/wp-content/plugins/meta-box/inc/fields/taxonomy.php(310): remove_meta_box('tagsdiv-type-of...', NULL, 'side')
#1 /public_html/wp-content/plugins/meta-box/inc/fields/taxonomy.php(301): RWMB_Taxonomy_Field::remove_default_meta_box(Array)
#2 /public_html/wp-content/plugins/meta-box/inc/field.php(535): RWMB_Taxonomy_Field::admin_enqueue_scripts(Array)
#3 /public_html/wp-content/plugins/meta-box-aio/vendor/meta-box/meta-box-group/group-field.php(52): RWMB_Field::call(Array, 'admin_enqueue_s...')
#4 /public_html/wp-content/plugins/meta-box/inc/field.php(535): RWMB_Group_Field::admin_enqueue_scripts(Array)
#5 /public_html/wp-admin/includes/template.php on line 1481

Thank you so much! It was on in one field and now it populates!

However, still getting this error: [11-Aug-2023 18:11:15 UTC] PHP Notice: Array to string conversion in /home/customer/www/domain/public_html/wp-content/plugins/elementor/includes/utils.php on line 506

However, I am in the process of migrating away from elementor to Bricks, and so it's not an issue for me. just letting you know!