Fatal error: Class 'Symfony\Component\Process\Process' not found in /var/www/html/dev/spa/vendor/symfony/process/Symfony/Component/Process/Tests/ProcessInSigchildEnvironment.php on line 17

Call Stack:
    0.0003     233008   1. {main}() /var/www/html/dev/spa/vendor/symfony/process/Symfony/Component/Process/Tests/ProcessInSigchildEnvironment.php:0