I was having trouble installing k2 without getting a BUNCH of fatal errors about invalid arguments...


My SOLUTION:

I was (unnecessarily) using something called qcache that created two files in my Joomla database called mysqli_cached and mysql_cache

The global configs were using one of the files as the database.

Solution. Go to your global configuration and make sure your database says "Mysql" (or mysqli if that's what kind of db you have) only.