magento2 – Magento 2 – php fatal error class not found


Whatever I try to run on my SSH-Server it displays the same error:

PHP Fatal error: Uncaught Error: Class ‘MagentoSetupMvcBootstrapInitParamListener’ not found in /var/www/vhosts/myurl.de/httpdocs/neu/setup/config/application.config.php:29
Stack trace:
#0 /var/www/vhosts/myurl.de/httpdocs/neu/vendor/magento/framework/Console/Cli.php(72): require()
#1 /var/www/vhosts/myurl.de/httpdocs/neu/bin/magento(22): MagentoFrameworkConsoleCli->__construct(‘Magento CLI’)
#2 {main}
thrown in /var/www/vhosts/myurl.de/httpdocs/neu/setup/config/application.config.php on line 29

I already tried to check the php files but I am a beginner at php…
Someone knows a solution?