Class "Barryvdh\Debugbar\ServiceProvider" not found, what's the problem?

Question

Composer

Broke Debugger, after executing the composer du...
Class "Barryvdh\Debugbar\ServiceProvider" not found - an error on the service provider, but there is such a file, there is no provider and alias in the config (isn't it in the new ones?). All through env...
Help if you have come across...

Answer 1

Are you sure that it is installed and composer is called without -no-dev as they do for production.