Fatal error: Uncaught Error: Class 'Symfony\Component\Console\Command\Command' not found in /home/optinadmin/rfl.optin.co.nz/concrete/src/Console/Command/InstallCommand.php:16 Stack trace: #0 {main} thrown in /home/optinadmin/rfl.optin.co.nz/concrete/src/Console/Command/InstallCommand.php on line 16