[英]Class 'Symfony\Component\EventDispatcher\Event' not found in Laravel/Lumen
尝试安装 Rackspace package（ composer require rackspace/php-opencloud ）时，出现以下错误Class 'Symfony\Component\EventDispatcher\Event' not found 。 我已经安装了 symfony package 但这无法解决。 请帮我解决这个问题。
尝试安装所需的package
composer require symfony/event-dispatcher
未捕获的类型错误：参数 2 传递给 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-找不到类Symfony \\ Component \\ Form \\ AbstractType
[英]Symfony 4 - Class Symfony\Component\Form\AbstractType not found
Symfony2中的设计模式：EventDispatcher是Mediator或Event Aggregator吗？
[英]Design pattern in Symfony2: is EventDispatcher a Mediator or Event Aggregator?
Laravel Seed db：seed [Symfony \\ Component \\ Debug \\ Exception \\ FatalThrowableError]致命错误：找不到类'model'
[英]Laravel Seed db:seed [Symfony\Component\Debug\Exception\FatalThrowableError] Fatal error: Class 'model' not found
Laravel 4.2 Symfony错误（找不到'Symfony \\ Component \\ Translation \\ TranslatorInterface'）
[英]Laravel 4.2 Symfony Error ('Symfony\Component\Translation\TranslatorInterface' not found)
找不到类“Symfony\\Component\\HttpFoundation\\RedirectResponse”
[英]Class 'Symfony\Component\HttpFoundation\RedirectResponse' not found
找不到类'Symfony \\ Component \\ HttpKernel \\ DependencyInjection \\ ConfigurableExtension'
[英]Class 'Symfony\Component\HttpKernel\DependencyInjection\ConfigurableExtension' not found
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