ApiGen documentation generation?

Question

PHP

I installed the ApiGen library via composer https://github.com/ApiGen/ApiGen
I don't understand how to start documentation generation?
There is a line in the manual: vendor/bin/apigen generate src --destination docs

An error occurs in the console

vendor/bin/apigen generate src --destination docs

===================================
ERROR 500 - Internal Server Error
Fatal error: Cannot use 'Object' as class name as it is reserved

If you use advise, a simple alternative to PhpDocumentor with installation via composer.