Thread:Project:Support desk/Problem Upgrading from 1.16.1 to 1.18.3/reply (5)

Ok, I've proven that I'm an idiot yet again! The upgrade instructions clearly state:

Files remaining that may cause If you are not using profiling, but have a StartProfiler.php file in the MediaWiki root folder, you may receive errors referring to /includes/Profiler.php. Deleting, or renaming, the StartProfiler.php file will resolve this error.

Removing that file solved the issue. No idea why I didn't see that in the first place!

Thanks for the help,

Wes