WordPress Admin page inaccessable

EDIT – I managed to resolve this problem by figuring out what was wrong with my CPanel login credentials and setting my site to a different theme from that side of things. I would still be interested in an answer to whether there was a way to do this WITHOUT database access, but it is no longer urgent.

I just uploaded a simple child theme to the lulu theme to my wordpress site (and by simple, I mean contained style.css and a couple of templates), and when I activated it, every page on my site, including the wp-admin pages, began to show the following error and nothing else:

Warning: require_once(/home/kwilsonx/public_html/wp-content/themes/lulu-child/admin/admin-functions.php) [function.require-once]: failed to open stream: No such file or directory in /home/kwilsonx/public_html/wp-content/themes/lulu/functions.php on line 85

Fatal error: require_once() [function.require]: Failed opening required ‘/home/kwilsonx/public_html/wp-content/themes/lulu-child/admin/admin-functions.php’ (include_path=’.:/usr/lib/php:/usr/local/lib/php’) in /home/kwilsonx/public_html/wp-content/themes/lulu/functions.php on line 85

Advice on how to make my child theme actually work would be appreciated, but my more pressing concern is whether there’s any way to resolve the error besides going into phpMyAdmin and monkeying with the database to get WordPress unstuck from my obviously nonfunctional child theme. (Which would be a suboptimal solution for me because the credentials I was given to log into Cpanel for the site don’t seem to work, and I won’t be able to resolve that for a few days…)