Fatal error: Uncaught Error: Interface 'Composer\Plugin\PluginInterface' not found in /home/itscm/dev.its.cm/webservices/vendor/symfony/flex/src/Flex.php:59 Stack trace: #0 {main} thrown in /home/itscm/dev.its.cm/webservices/vendor/symfony/flex/src/Flex.php on line 59