Error consolidation/annotated-command
I get this error after changing the minimum version of drush/drush to ~9.0 in my composer.json and running composer update drush/drush afterwards. 

I solved it by just executing composer require drush/drush:~9.0 which lead to the error message drush/drush 9.5.x-dev requires symfony/config ^3.4, so I had to execute composer require symfony/config:^3.4 before composer require drush/drush:~9.0 could be finished successful.

Don't know if this is the only way or best practice to solve such a dependency conflict but in short this worked for me:


composer require symfony/config:^3.4
composer require drush/drush:~9.0