Fatal error: Uncaught Error: Class 'Symfony\Component\DependencyInjection\ParameterBag\ParameterBag' not found in C:\SistemasPHP\observatorio4\vendor\symfony\dependency-injection\ParameterBag\EnvPlaceholderParameterBag.php:20 Stack trace: #0 {main} thrown in C:\SistemasPHP\observatorio4\vendor\symfony\dependency-injection\ParameterBag\EnvPlaceholderParameterBag.php on line 20