Fatal error: Uncaught Error: Class "Psr\Log\AbstractLogger" not found in /var/www/html/ohnishi-test.site/PayPal-PHP-SDK-master_v2/lib/PayPal/Log/PayPalLogger.php:9 Stack trace: #0 {main} thrown in /var/www/html/ohnishi-test.site/PayPal-PHP-SDK-master_v2/lib/PayPal/Log/PayPalLogger.php on line 9