Magento 2 cron.php fatal error

Fatal error: Uncaught Error: Class 'Magento\Framework\Console\CLI' not found in my-site.com/vendor/magento/module-cron/Observer/ProcessCronQueueObserver.php:173 Stack trace: #0 my-site.com/vendor/magento/framework/Event/Invoker/InvokerDefault.php(73): Magento\Cron\Observer\ProcessCronQueueObserver->execute(Object(Magento\Framework\Event\Observer)) #1 my-site.com/vendor/magento/framework/Event/Invoker/InvokerDefault.php(61): Magento\Framework\Event\Invoker\InvokerDefault->_callObserverMethod(Object(Magento\Cron\Observer\ProcessCronQueueObserver), Object(Magento\Framework\Event\Observer)) #2 my-site.com/vendor/magento/framework/Event/Manager.php(66): Magento\Framework\Event\Invoker\InvokerDefault->dispatch(Array, Object(Magento\Framework\Event\Observer)) #3 my-site.com/var/generation/Magento/Framework/Event/Manager/Proxy.php(95): Magento\Framework\Event\Manager->dispatch('default', Array) #4 my-site.com/vendor/magento/frame in my-site.com/vendor/magento/module-cron/Observer/ProcessCronQueueObserver.php on line 173