Edit Permalink Structure For Custom Post Type or Modify .htaccess?

Based on your pastebin of the plugin code, the issue seems to be in the registration of the custom post type. The issue is on line 25. “Rewrite” should be set to true.

<?php
                private $postTypeArgs = array(
                    'public' => true,  
                    'rewrite'=> false,                
                    'singular_label' => 'mydomainlist',
                    'publicly_queryable' => true,
                    'show_ui' => true,
                    'show_in_menu' => true,
                    'query_var' => true,                   
                    'capability_type' => 'post',
                    'has_archive' => true,
                    'hierarchical' => false,
                    'menu_position' => 5,      
                    'supports' => array('title','editor','author','thumbnail','excerpt','comments', 'custom-fields', 'revisions')
                );    

You should use: ‘rewrite’=> true