I have practically 0 PHP knowledge. I have a wp blog, I just published my first post, and when I try to use the comments, I get the following:
Warning: call_user_func(twentyten_comment) [function.call-user-func]: First argument is expected to be a valid callback in /home/erisdesi/public_html/wp-includes/comment-template.php on line 1308
Here's the post: http://www.erisdesigns.net/2010/08/27/make-your-own-20xx-daily-planner/
I wish I could be more helpful.