hi i'm having the following error in laravel on my ubuntu server yet the same exact code works on my local host

Symfony\Component\Debug\Exception\FatalThrowableError thrown with message "Parse error: syntax error, unexpected '?'"

Stacktrace:
#0 Symfony\Component\Debug\Exception\FatalThrowableError in /var/www/html/awsmonitor/aws-monitor/vendor/symfony/css-selector/Node/SelectorNode.php:40

via Chebli Mohamed