Thread:Help talk:Repairing SMW's data/Data repair and upgrade after update/reply (2)

I upgraded from MW 1.22 - 1.25 and ran the database upgrade, SMW I upgraded to the latest version from 1.8.5.3, so quite an old version. I followed the instructions re: Composer and now I get:

MediaWiki requires the PSR-3 logging library to be present. This library is not embedded directly in MediaWiki's git repository and must be installed separately by the end user. Please see mediawiki.org for help on installing the required components.

Having to go AFK now, bit surprised how difficult this process has been, I had it up and running quite well before.