Fatal error: Uncaught Error: Class "Psr\Log\AbstractLogger" not found in C:\mywamp\sites\allsite\calcomposer\vendor\symfony\console\Logger\ConsoleLogger.php:27 Stack trace: #0 {main} thrown in C:\mywamp\sites\allsite\calcomposer\vendor\symfony\console\Logger\ConsoleLogger.php on line 27