Custom Post Type 404 Errors in WordPress.

Description
Custom post type URLs return a 404 error.

Causes
Permalinks are not flushed after registering the custom post type.

Solution

• Add the following function to functions.php to flush permalinks:

function custom_flush_rewrite_rules() {
    flush_rewrite_rules();
}
add_action('after_switch_theme', 'custom_flush_rewrite_rules');

• Visit Settings → Permalinks and click "Save Changes."

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