Ever since I last updated my MediaWiki repo to master I can't load /index.php or /mw-config/index.php (or run update.php). They all generate a 500 server error:
"PHP Fatal error: Interface 'Psr\Log\LoggerInterface' not found in /Users/kaldari/Sites/core/includes/debug/logger/Logger.php on line 46"
Even tried it with a completely fresh clone of MediaWiki and got the same result.
Currently running PHP 5.4.24 in MacOS X 10.9.4.
Version: 1.25-git
Severity: major