Mysql Errors

[ZiNgA BuRgA]

And I presume you didn't actually move the files over, and put on a newer version of XThreads (so you're stuck with an old version of the database with new version of the files, something you should never do).
If you know what version you previously had installed, you can try changing the defined version in cache/xthreads.php, which will allow the upgrader to update your database.

I hope you haven't done the same thing with MyBB itself.