Edit File: LoggerAwareTrait.php
<?php namespace Psr\Log; /** * Basic Implementation of LoggerAwareInterface. */ trait LoggerAwareTrait { /** * The logger instance. * * @var LoggerInterface|null */ protected $logger; /** * Sets a logger. * * @param LoggerInterface $logger */ public function setLogger(LoggerInterface $logger) { $this->logger = $logger; } }