Custom post types and child theme

Okay, here’s the deal. I am working with a child theme and I want a custom post type.

What I did

Added the following code the functions.php of the parent theme.

add_action( 'init', 'create_fb_foto_post_type' );
function create_fb_foto_post_type() {
    register_post_type('fotos',
        array(
            'labels' => array(
                'name' => __( 'Foto's' ),
                'singular_name' => __( 'Foto' )
            ),
        'public' => true,
        'has_archive' => true,
        'taxonomies' => array('post_tag')
        )
    );
}

Created a template file single-fotos.php which contains this code:

<?php get_header(); ?>

        <div id="primary" class="site-content">
            <div id="content" role="main">

                <?php while ( have_posts() ) : the_post(); ?>

                    <?php get_template_part( 'content', 'page' ); ?>

                    <?php comments_template( '', true ); ?>

                <?php endwhile; // end of the loop. ?>

            </div><!-- #content -->
        </div><!-- #primary -->

<?php get_footer(); ?>

And uploaded it to the child theme’s directory.

What goes wrong

I can choose to create a new ‘Foto’ page when I’m in WordPress and it contains the tag field. But! When I want to view an example, WordPress does nothing. When I choose to submit and publish the page it works but when I then want to view it, I get a 404.

What I tried

I tried uploading the template to the parent theme’s directory (after I had created the page) but this doesn’t work either.

Any ideas?