./bin/console server:run Surprise! There are no commands defined in the "server" namespace.

Let's start the built-in web server:

 

./bin/console server:run

Surprise!

There are no commands defined in the "server" namespace.

Remember: with Flex, you opt in to features. Run:

 

composer require server

 

 

 

参考:https://symfonycasts.com/screencast/symfony4-upgrade/server-isgranted