how can I remove registered .tpl.php file? When I remove html.tpl.php file, I get this error:

Warning: include(/home/xxxx/public_html/sites/all/themes/cgame/html.tpl.php) [function.include]: failed to open stream: No such file or directory in theme_render_template() (line 1413 of /home/xxxx/public_html/includes/theme.inc).
Warning: include() [function.include]: Failed opening '/home/xxxx/public_html/sites/all/themes/cgame/html.tpl.php' for inclusion (include_path='.:/usr/lib/php:/usr/local/lib/php') in theme_render_template() (line 1413 of /home/xxxx/public_html/includes/theme.inc).


How can I remove this file to force drupal use core html.tpl.php file?
Simply clear the caches either on /admin/config/development/performance or via drush cc all if you've configured drush.