Fatal error upgrading to 2.5.0

Hi,
I upgraded to 2.5.0 and I am getting an error message
PHP Fatal error: Uncaught Error: Failed opening required '/var/www/mycg.flipside-staging.com/html/current/wp-content/plugins/advanced-cron-manager/vendor/composer/platform_check.php' (include_path='.:/usr/share/pear:/usr/share/php:/usr/share/pear:/usr/share/php') in /var/www/mycg.flipside-staging.com/html/current/wp-content/plugins/advanced-cron-manager/vendor/composer/autoload_real.php:25, referer: https://mycg.flipside-staging.com/
I guess it’s the same issue that I had at the beginning of the year, and the same as here. We always check in plugins to ensure that we have a repeatable tested website with no external dependencies. Would you be able to fix this please?

Thank you
Derek