I just want to indicate this "[ZtTpZ5VwMzObl1msU0TfYAAAALg] Exception caught: A database query error has occurred. This may indicate a bug in the software.". This happens every time I try to upload an image to the wiki and I've installed MediaWiki through the Softaculous extensions downloader.
Topic on Project:Support desk
Apparently, this also happens when saving a page.
@NormalRichard: Have you run the updater? See Manual:How to debug for some info about what to try.