Getting this message at payment:
Could not locate language file: includes/languages/english/modules/order_total/ot_firsttime.php

Uh, there is no module installed by that name - no files on the site I can find. I checked the configuration table and don't see anything there.

I did take over this website after someone else had been mucking about in it so anything is possible but I don't have any idea what at this moment!

What else can I look for?