I (as well as my admins) get this error on my home page and it happen after I went to merge two threads together.
Fatal error: Class name must be a valid object or a string in /home/site/public_html/library/XenForo/Model/ModerationQueue.php on line 219
Also worth noting, I'm getting this error when trying to view the daily (or any option) statistics.
Fatal error: Class name must be a valid object or a string in /home/site/public_html/library/XenForo/Model/Stats.php on line 297
It almost seems like the site didn't get restored correctly and I know I was missing files after the restore, so I'm assuming it's part of that.
I've tried running the /install/ again to rebuild the master data, but no luck so far.