Fatal error: Uncaught Error: Class 'Composer\Installers\BaseInstaller' not found in C:\SistemasPHP\observatorio4\vendor\composer\installers\src\Composer\Installers\SilverStripeInstaller.php:6
Stack trace:
#0 {main}
thrown in C:\SistemasPHP\observatorio4\vendor\composer\installers\src\Composer\Installers\SilverStripeInstaller.php on line 6