TYPO3 Core

The configure method calls $this->setHidden:

/**
 * Configure the command, since this is a command
     */
    protected function configure()
{
        $this->setHidden(true);
    }

The setHidden method was added in symfony/console 3.2 and thus is not available in 2.7 (and neither in 3.0 or 3.1), leading to a crash.

This problem occurs if extbase is installed as a Composer dependency with the --prefer-lowest Composer option (which I use to check that with the lowest dependencies of my projects, everything still works).

The solution is to require symfony/console ^3.2 (or ^4.0).

This problem only affects 8.7, as in master, symfony/console ^4.1 is required, and in 7.6, the Core Command class does not exist yet.