server:run Exception There are no commands defined in the “server” namespace

Question

When I run the server using php bin/console server:run I get the following error. There are no commands defined in the \"server\" namespace.

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Answer 1

upgrading from symfony <3.3 to symfony >3.3 will cause this problem because the web server was extracted out to a separate bundle.

so you'll need to require this bundle:

composer require symfony/web-server-bundle --dev

and in your AppKernel

 if ('dev' === $this->getEnvironment()) {
        $bundles[] = new Symfony\Bundle\WebServerBundle\WebServerBundle();
    }

for more info: check here