WordPress Custom Post Type Single View Not Working - 404 Error

Other Questions Wordpress
1

I created a custom post type in WordPress and I can see all the posts on my archive page. But when I try to click on individual post links, I get a 404 error page. The URL seems to be getting duplicated somehow.

Here’s my custom post type code:

add_action('init', 'setup_gallery_type');

function setup_gallery_type(){
    $gallery_settings = array(
        'label' => _('Gallery'),
        'singular_label' => _('Gallery Item'),
        'public' => true,
        'show_ui' => true,
        'capability_type' => 'post',
        'hierarchical' => false,
        'rewrite' => true,
        'supports' => array('title', 'editor', 'thumbnail')
    );
    
    register_post_type('gallery', $gallery_settings);
}

My template file looks like this:

<?php
/*
Template Name: Gallery Display
*/
get_header(); ?>

<?php
$query_params = array(
    'post_type' => 'gallery',
    'post_status' => 'publish'
);

$gallery_query = new WP_Query($query_params);

if($gallery_query->have_posts()) :
    while($gallery_query->have_posts()) : $gallery_query->the_post();
?>
        <h2><a href="<?php echo get_post_permalink() ?>"><?php echo the_title();?></a></h2>
        <?php the_post_thumbnail('medium'); ?>
        <?php the_excerpt(); ?>
<?php
    endwhile;
else :
?>
    <p>No gallery items found.</p>
<?php
endif;
get_footer();
?>

When I hover over a post title link, it shows: mysite.com/wp/gallery/summer-photos

But clicking it takes me to: mysite.com/wp/gallery/summer-photos/summer-photos/

Why is the slug getting repeated twice in the URL? How can I fix this single post view issue?

2

This duplicate slug issue arises when your WordPress permalinks conflict with custom post type rewrite rules. I’ve faced this similar problem before; it often occurs if you have a page and a custom post type using the same slug. First, check if there’s a page named ‘gallery’ in your WordPress admin. If it exists, consider renaming it or changing your custom post type slug to ‘galleries’ or ‘photo-gallery.’ Also, modify your rewrite setting to: ‘rewrite’ => array(‘slug’ => ‘gallery’, ‘with_front’ => false). After this, navigate to Settings > Permalinks and click ‘Save Changes’ to flush the rewrite rules, which should resolve the 404 errors and eliminate the duplicate URL issue.

3

you’re missing flush_rewrite_rules() after registering your post type. add it right after the register_post_type line in your function. the url duplication happens when wordpress gets confused about rewrite rules and tries to match patterns twice.

4

This happens because WordPress can’t find the right template for your custom post type. You’re missing the single template file - WordPress needs either single-gallery.php or single.php to show individual posts, but you’ve only got the archive template. Create single-gallery.php in your active theme folder with standard single post template code. Also fix your register_post_type function - use 'rewrite' => array('slug' => 'gallery') instead of just 'rewrite' => true. Once you’ve done that, go to WordPress admin > permalinks and hit save to refresh the rewrite rules. That’ll fix both the 404s and duplicate URL issues.