Fatal error: Uncaught Error: Class 'Composer\Installers\BaseInstaller' not found in /srv/drbd-web/home/chelix/public_html/wp-content/plugins/all-in-one-event-calendar/apiki/vendor/composer/installers/src/Composer/Installers/SilverStripeInstaller.php on line 6

Error: Class 'Composer\Installers\BaseInstaller' not found in /srv/drbd-web/home/chelix/public_html/wp-content/plugins/all-in-one-event-calendar/apiki/vendor/composer/installers/src/Composer/Installers/SilverStripeInstaller.php on line 6

Call Stack:
    0.0015     361720   1. {main}() /srv/drbd-web/home/chelix/public_html/wp-content/plugins/all-in-one-event-calendar/apiki/vendor/composer/installers/src/Composer/Installers/SilverStripeInstaller.php:0