Thread:Project:Support desk/Upload File not working with Oracle/reply (3)

I've looked at those lines and I don't see anything wrong there, despite the fact that somewhere an object is being passed to strpos instead of a string. I haven't seen this error before, so maybe you're using some MediaWiki extension that's not compatible with the MediaWiki version you're running? You could try disabling all extensions.

Anyway, 1.22 has released new security updates, so you should upgrade to latest 1.22.x to see if that fixes your issue.