[英]Class 'Symfony\Component\EventDispatcher\Event' not found in Laravel/Lumen
嘗試安裝 Rackspace package（ composer require rackspace/php-opencloud ）時，出現以下錯誤Class 'Symfony\Component\EventDispatcher\Event' not found 。 我已經安裝了 symfony package 但這無法解決。 請幫我解決這個問題。
嘗試安裝所需的package
composer require symfony/event-dispatcher
未捕獲的類型錯誤：參數 2 傳遞給 Symfony\\Component\\EventDispatcher\\EventDispatcher // Contao 4.7 & Symfony
[英]Uncaught TypeError: Argument 2 passed to Symfony\Component\EventDispatcher\EventDispatcher // Contao 4.7 & Symfony
Symfony 4-找不到類Symfony \\ Component \\ Form \\ AbstractType
[英]Symfony 4 - Class Symfony\Component\Form\AbstractType not found
Symfony2中的設計模式：EventDispatcher是Mediator或Event Aggregator嗎？
[英]Design pattern in Symfony2: is EventDispatcher a Mediator or Event Aggregator?
Laravel Seed db：seed [Symfony \\ Component \\ Debug \\ Exception \\ FatalThrowableError]致命錯誤：找不到類'model'
[英]Laravel Seed db:seed [Symfony\Component\Debug\Exception\FatalThrowableError] Fatal error: Class 'model' not found
Laravel 4.2 Symfony錯誤（找不到'Symfony \\ Component \\ Translation \\ TranslatorInterface'）
[英]Laravel 4.2 Symfony Error ('Symfony\Component\Translation\TranslatorInterface' not found)
找不到類“Symfony\\Component\\HttpFoundation\\RedirectResponse”
[英]Class 'Symfony\Component\HttpFoundation\RedirectResponse' not found
找不到類'Symfony \\ Component \\ HttpKernel \\ DependencyInjection \\ ConfigurableExtension'
[英]Class 'Symfony\Component\HttpKernel\DependencyInjection\ConfigurableExtension' not found
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