An unidentified error has occurred when deleting a category

Your taxonomy registration in your example is showing this:

function insurance_all_category(){
$labels = array(
    'name'              =>_x( 'Insurance all category', 'taxonomy general name' ),
    'singular_name'     => _x( 'Category', 'taxonomy singular name' ),
    'search_items'      => __( 'Search Category' ),
    'all_items'         => __( 'All Categories' ),
    'parent_item'       => __( 'Parent Category' ),
    'parent_item_colon' => __( 'Parent Category:' ),
    'edit_item'         => __( 'Edit Category' ),
    'update_item'       => __( 'Update Category' ),
    'add_new_item'      => __( 'Add New Category' ),
    'new_item_name'     => __( 'New Category' ),
    'menu_name'         => __( 'Categories' ),

);

register_taxonomy('insurnce_all_categories', array('insurance_all'),$args);}add_action('init','insurance_all_category');?>

and needs to be this:

function insurance_all_category(){
$labels = array(
    'name'              =>_x( 'Insurance all category', 'taxonomy general name' ),
    'singular_name'     => _x( 'Category', 'taxonomy singular name' ),
    'search_items'      => __( 'Search Category' ),
    'all_items'         => __( 'All Categories' ),
    'parent_item'       => __( 'Parent Category' ),
    'parent_item_colon' => __( 'Parent Category:' ),
    'edit_item'         => __( 'Edit Category' ),
    'update_item'       => __( 'Update Category' ),
    'add_new_item'      => __( 'Add New Category' ),
    'new_item_name'     => __( 'New Category' ),
    'menu_name'         => __( 'Categories' ),

);

//new code
$args = array(
    'labels' => $labels
);

register_taxonomy('insurnce_all_categories', array('insurance_all'),$args);}add_action('init','insurance_all_category');?>