You just need to make sure that you haven't disabled comments on that particular page. There is a box on the Page edit screen called Discussion, you'll need to make sure that the comments haven't been disable there.

Ok I think I found the problem. To get you working again while I work on a permanent solution in the next version you'll need to edit the tech-comments-functions.php file in the functions folder in the main theme folder. You need to look for this text and delete it.

After that you should be working again. All this code does is give an easier way for admins to spam or trash comments without having to go to the backend. I will try to figure out why it's not working for pages and fix it for the next version. Please let me know if this doesn't fix your problem.