Interface 'Psr\Log\LoggerInterface' not found

[jmverges]

"PHP message: PHP Fatal error: Interface 'Psr\Log\LoggerInterface' not found in /www/typo3_src/typo3/sysext/core/Classes/Log/Logger.php on line 24" while reading response header from upstream, client: 127.0.0.1, server: myserver.com, request: "GET /index.php HTTP/1.1", upstream: "fastcgi://unix:/var/run/php-fpm-vagrant.socket:", host: "myserver.com"

[marcosdsdba]

Try it : ~# composer require psr/log

Call /vender/autoload.php and 'use \Psr\Log\LoggerInterface;'

[mythnc]

I just met the same error, and found some solutions.

https://phabricator.wikimedia.org/T74932

composer install could solve this question