Hey Elliot, no problem!
Sorry no, I specified the slug to get rid of the error 🙂
Sure, tell me what to do, here is line 251:
$child_page = add_submenu_page( $page['parent'], $page['title'], $page['title'], $page['capability'], $page['slug'], array($this, 'html'));
And then of course the bigger problem is my fields not showing for these pages.