Bootstrap Navwalker not displaying

I use it this way. I have never encountered any problems.

Bootstrap 3.x Navigation with dropdown for wordpress.

<nav class="navbar navbar-default">
<div class="navbar-header">
    <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-navbar-collapse" aria-expanded="false">
        <span class="sr-only">Toggle navigation</span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
    </button>
    <a class="navbar-brand visible-xs" href="#">MENU</a>
</div>

<div class="collapse navbar-collapse" id="bs-navbar-collapse">
    <?php
        wp_nav_menu( array(
            'theme_location'    => 'primary',
            'depth'             => 2,
            'container'         => '',
            'menu_class'        => 'nav navbar-nav',
            'fallback_cb'       => 'wp_bootstrap_navwalker::fallback',
            'walker'            => new wp_bootstrap_navwalker())
        );
    ?>
    <ul class="nav navbar-nav navbar-right">
        <?php if ( is_user_logged_in() ) { ?>
        <li class="dropdown">
            <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false"><i class="fa fa-user-plus" aria-hidden="true"></i> HESABIM <span class="caret"></span></a>
            <ul class="dropdown-menu">
                <?php foreach ( wc_get_account_menu_items() as $endpoint => $label ) : ?>
                <li><a href="<?php echo esc_url( wc_get_account_endpoint_url( $endpoint ) ); ?>"><?php echo esc_html( $label ); ?></a></li>                             
                <?php endforeach; ?>
            </ul>
        </li>
        <?php } else { ?>
        <li><a href="<?php echo get_permalink( get_option('woocommerce_myaccount_page_id') ); ?>" title="Üye Ol / Giriş Yap">Üye Ol / Giriş Yap</a></li>
        <?php } ?>
    </ul>
</div>

Navigation Only;

<div class="collapse navbar-collapse" id="bs-navbar-collapse">
<?php
    wp_nav_menu( array(
        'theme_location'    => 'primary',
        'depth'             => 2,
        'container'         => '',
        'menu_class'        => 'nav navbar-nav',
        'fallback_cb'       => 'wp_bootstrap_navwalker::fallback',
        'walker'            => new wp_bootstrap_navwalker())
    );
?>
</div>