sidebar call

<?php if ( is_active_sidebar( 'header-1' ) ) : ?>
<?php dynamic_sidebar( 'header-1' ); ?>
<?php else : ?>

<!-- This content shows up if there are no widgets defined in the backend. -->

<div class="alert alert-danger">
<p><?php _e( 'Please activate some Widgets.', 'bonestheme' );  ?></p>
</div>