Made Custom Post Types, but single.php not working

Question

I made some Custom Post Types, filled them up with some posts, added the template tags to the templates.

The problem now is that whenever I click the 'Read More' button on a custom post type (the_permalink()), it doesn't show the singlepage. It shows the homepage.

I've created a single.php file and a single-smoelenboek.php file, it should go to 1 of those 2.

I've also flushed by clicking the 'Save' button in settings -> permalinks.

Permalinks are on Post Name right now, I them around a bit, but it didn't matter.

The Custom Post Type

    function smoelenboek() {
    $labels = array(
    'name'               => _x( 'Smoelenboek Sectie', 'post type general name', 'your-plugin-textdomain' ),
    'singular_name'      => _x( 'Smoelenboek Sectie', 'post type singular name', 'your-plugin-textdomain' ),
    'menu_name'          => _x( 'Smoelenboek Sectie', 'admin menu', 'your-plugin-textdomain' ),
    'name_admin_bar'     => _x( 'Smoelenboek Sectie', 'add new on admin bar', 'your-plugin-textdomain' ),
    'add_new'            => _x( 'Smoelenboek item toevoegen', 'content', 'your-plugin-textdomain' ),
    'add_new_item'       => __( 'Voeg een nieuwe Smoelenboek item toe', 'your-plugin-textdomain' ),
    'new_item'           => __( 'Nieuwe Smoelenboek item', 'your-plugin-textdomain' ),
    'edit_item'          => __( 'Bewerk Smoelenboek item', 'your-plugin-textdomain' ),
    'view_item'          => __( 'Bekijk Smoelenboek item', 'your-plugin-textdomain' ),
    'all_items'          => __( 'Alle Smoelenboek items', 'your-plugin-textdomain' ),
    'search_items'       => __( 'Zoek Smoelenboek items', 'your-plugin-textdomain' ),
    'parent_item_colon'  => __( 'Hoofd Smoelenboek items', 'your-plugin-textdomain' ),
    'not_found'          => __( 'Geen Smoelenboek items gevonden', 'your-plugin-textdomain' ),
    'not_found_in_trash' => __( 'Geen Smoelenboek items gevonden in prullenbak', 'your-plugin-textdomain' )
    );

    $args = array(
    'label' => __('smoelenboek'),
    'labels'             => $labels,
    'public'             => true,
    'publicly_queryable' => true,
    'show_ui'            => true,
    'show_in_menu'       => false,
    'query_var'          => true,
    'rewrite'            => array( 'slug' => 'smoelenboek' ),
    'capability_type'    => 'post',
    'has_archive'        => false,
    'hierarchical'       => true,
    'menu_position'      => null,
    'supports'           => array( 'title', 'editor', 'thumbnail', 'custom-fields', 'revisions','post-formats' )
    );

    register_post_type( 'smoelenboek', $args );
    }

add_action( 'admin_init', 'smoelenboek' );

The Section

<?php $options = get_option( 'custom_voorpagina_panel_smoelenboek' );  ?>
<section id="smoelenboek">
<div class="container persoon-wrapper">
<h1> <?php echo $options['smoelenboek-titel']; ?> </h1>
<h3> <?php echo $options['smoelenboek-sub-titel']; ?> </h3>

<?php
$loop = new WP_Query(
array(
'post_type' => 'smoelenboek', 
'posts_per_page' => 4
)
);
while($loop->have_posts()):
$loop->the_post();
$thumbnail_url = wp_get_attachment_url(get_post_thumbnail_id());

?>

<div class="persoon">
<?php 

$image = get_field('afbeelding');

if( !empty($image) ): 


// thumbnail
$size = 'products_thumb';
$thumb = $image['sizes'][ $size ];
$width = $image['sizes'][ $size . '-width' ];
$height = $image['sizes'][ $size . '-height' ];

?>

<img src="<?php echo $thumb; ?>" width="<?php echo $width; ?>" height="<?php echo $height; ?>">
<div class="wrapper">
<h3> <?php the_title(); ?> </h3>
<a href="<?php the_permalink() ?>"> <?php the_field('button_tekst') ?></a>
</div>
</div>
<?php
endif;
endwhile;
?>  
</div>   

<div class="meer-personen container">
<a href="/"> <?php echo $options['smoelenboek-bekijk-meer']; ?> </a>
</div>

</section>

Conclusion: Created custom post type, single page of custom post type not working. It would be nice if someone could help me with this.

EDIT: also single-smoelenboek.php is not working.
EDIT 2: /hello-world works. Picks up the single.php perfectly fine.

Thanks, Dan.

Answer 1

The admin-init hook only fires on admin screens. The correct hook to use for registering post types is init.

So change:

add_action( 'admin_init', 'smoelenboek' );

... to ...

add_action( 'init', 'smoelenboek' );

... and flush your rewrite rules once (save permalink settings in admin) and all should be well.