Does not list categories

my code in functions.php

function mamazanuda_widgets_init() {
	register_sidebar( array(
		'name'          => __( 'Sidebar', 'mamazanuda' ),
		'id'            => 'sidebar-1',
		'description'   => __( 'Add widgets here.', 'mamazanuda' ),
	) );
}
add_action( 'widgets_init', 'mamazanuda_widgets_init' );

in sidebar.php

<?php if (is_active_sidebar( 'sidebar-1' ) ) : ?>
    <aside>
        <?php dynamic_sidebar( 'sidebar-1' ); ?>
    </aside
<?php endif; ?>

In cms panel on “widgets” i choose “WP-dTree Categories”, but on front page categories are not displayed, please, tell me what I’m doing wrong?

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