XF 2.0 Unable to post new threads


Our forums at http://forums.deltaprintr.com/index.php have an issue where we're unable to post new threads. I think this is due to some legacy add-on code that was manually added into the templates, but when checking the outdated templates and modified templates page in admin, it doesn't show anything. I've had 4 legacy add-ons that were disabled and I've now uninstalled them.

I'm not sure if I have code somewhere that is legacy in a template or what, but this is the error I get. I have Xenforo 2.0.3. Can anyone help me figure out what the issue is? No one on my forums can start a new thread but they can reply to existing threads. Here's the error when I try to start a new thread. It seems to be related to this plugin/issue but I have no idea how to fix it: https://xenforo.com/community/threads/mark-posts-as-best-answer-deleted.55423/post-1006532

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The error is due to a (disabled) third party add-on - something to do with best answers.

Either enable the add-on, or contact the author for an updated fixed version, or assistance in resolving the error.
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