The 4th parameter in add_options_page needs to be a slug. You currently have it as a phrase. Try replacing with this:
add_options_page('Chapter Display', 'Chapter Display', 'manage_options', 'chapter-display.php', 'ChapterDisplay_Admin');
Also, since you have already set the capability for this page to manage_options when you registered it with add_options_page, you don’t need your wp_die statement.