"Cannot use empty array elements in arrays" after adding code from Generator

Hi

just wanted to try the Taxonomy Generator for creating a custom category "PagesCat" for my pages.

After I have filled the fields of the Generator, copied the code and added it (without the opening php-tag) to my child-themes function.php, the following error occurred:

"Your PHP code changes were rolled back due to an error on line 47 of file wp-content/themes/generatepress_child/functions.php. Please fix and try saving again.
Cannot use empty array elements in arrays"

What did I do wrong here?

The functions.php only contains the generated code, so I hope you don't mind me pasting it here:

<?php
/**
 * GeneratePress child theme functions and definitions.
 *
 * Add your custom PHP in this file.
 * Only edit this file if you have direct access to it on your server (to fix errors if they happen).
 */

add_action( 'init', 'mb_register_taxonomy_for_pages' );
function mb_register_taxonomy_for_pages() {
	$args = [
		'label'  => esc_html__( 'PagesCat', 'mb-tax-for-pages' ),
		'labels' => [
			'menu_name'                  => esc_html__( 'PagesCat', 'mb-tax-for-pages' ),
			'all_items'                  => esc_html__( 'All PagesCat', 'mb-tax-for-pages' ),
			'edit_item'                  => esc_html__( 'Edit PagesCat', 'mb-tax-for-pages' ),
			'view_item'                  => esc_html__( 'View PagesCat', 'mb-tax-for-pages' ),
			'update_item'                => esc_html__( 'Update PagesCat', 'mb-tax-for-pages' ),
			'add_new_item'               => esc_html__( 'Add new PagesCat', 'mb-tax-for-pages' ),
			'new_item'                   => esc_html__( 'New PagesCat', 'mb-tax-for-pages' ),
			'parent_item'                => esc_html__( 'Parent PagesCat', 'mb-tax-for-pages' ),
			'parent_item_colon'          => esc_html__( 'Parent PagesCat', 'mb-tax-for-pages' ),
			'search_items'               => esc_html__( 'Search PagesCat', 'mb-tax-for-pages' ),
			'popular_items'              => esc_html__( 'Popular PagesCat', 'mb-tax-for-pages' ),
			'separate_items_with_commas' => esc_html__( 'Separate PagesCat with commas', 'mb-tax-for-pages' ),
			'add_or_remove_items'        => esc_html__( 'Add or remove PagesCat', 'mb-tax-for-pages' ),
			'choose_from_most_used'      => esc_html__( 'Choose most used PagesCat', 'mb-tax-for-pages' ),
			'not_found'                  => esc_html__( 'No PagesCat found', 'mb-tax-for-pages' ),
			'name'                       => esc_html__( 'PagesCat', 'mb-tax-for-pages' ),
			'singular_name'              => esc_html__( 'PagesCat', 'mb-tax-for-pages' ),
		],
		'public'               => false,
		'show_ui'              => true,
		'show_in_menu'         => true,
		'show_in_nav_menus'    => false,
		'show_tagcloud'        => true,
		'show_in_quick_edit'   => true,
		'show_admin_column'    => false,
		'show_in_rest'         => true,
		'hierarchical'         => false,
		'query_var'            => true,
		'sort'                 => false,
		'rewrite_no_front'     => false,
		'rewrite_hierarchical' => false,
		'rewrite' => true
	];
	register_taxonomy( 'pagescat', [ , 'page' ], $args );
}

Thank you in advance and kind regards,
Sascha