Invalid Menu Items – The most interesting question



The question needs it so I captured the error.It is necessary so please watch it.

https://youtu.be/lME3lY-kNbA if it doesnt open, please try this:

I told the question on youtube video so I share only the code like what I said on video.

I hear that video,video,video are you youtuber? 😀 no, it needed

this one works:

function deneme() {      // Add new taxonomy, make it hierarchical like categories     //first do the translations part for GUI          $  labels = array(             'name' => _x( '000', 'taxonomy general name' ),             'singular_name' => _x( '000', 'taxonomy singular name' ),             'search_items' =>  __( '000' ),             'all_items' => __( 'All Locations' ),             'parent_item' => __( 'Parent Locations' ),             'parent_item_colon' => __( 'Parent Location:' ),             'edit_item' => __( 'Edit Location' ),             'update_item' => __( 'Update Location' ),             'add_new_item' => __( 'Add New Location' ),             'new_item_name' => __( 'New Topic Location' ),             'menu_name' => __( '000' ),         );      // Now register the taxonomy          register_taxonomy('000',array('post'), array(             'hierarchical' => true,             'labels' => $  labels,             'show_ui' => true,             'show_admin_column' => true,             'query_var' => true,             'show_in_rest' => true,             'rewrite' => true,             'rewrite' => array( 'slug' => '000' ),             'has_archive' => true,         ));      }      add_action( 'init', 'deneme', 0 ); 

and this is the problem source:

nowadays, I select prayer for functions names 😀 such as masallah ( I hope the god protect ) or insallah ( I hope God will help to become real ) but yes I am here to ask 😀

// 2. ekleme  function masallah() {  // Add new taxonomy, make it hierarchical like categories //first do the translations part for GUI      $  labels = array(         'name' => _x( 'Districts', 'taxonomy general name' ),         'singular_name' => _x( 'District', 'taxonomy singular name' ),         'search_items' =>  __( 'Search Districts' ),         'all_items' => __( 'All Districts' ),         'parent_item' => __( 'Parent Districts' ),         'parent_item_colon' => __( 'Parent District:' ),         'edit_item' => __( 'Edit District' ),         'update_item' => __( 'Update District' ),         'add_new_item' => __( 'Add New District' ),         'new_item_name' => __( 'New Topic District' ),         'menu_name' => __( 'Districts' ),     );  // Now register the taxonomy      register_taxonomy('Districts',array('post'), array(         'hierarchical' => true,         'labels' => $  labels,         'show_ui' => true,         'show_admin_column' => true,         'query_var' => true,         'show_in_rest' => true,         'rewrite' => true,         'rewrite' => array( 'slug' => 'districts' ),         'has_archive' => true,     ));  }  add_action( 'init', 'masallah', 0 );