Ошибки при установке symfony

После ввода:

sudo composer create-project symfony/website-skeleton my-project

Выводит:

[RuntimeException]
  Could not load package symfony/website-skeleton in http://packagist.org: [UnexpectedValueException] Could not parse
   version constraint ^7.0.8: Invalid version string "^7.0.8"
[UnexpectedValueException]
Could not parse version constraint ^7.0.8: Invalid version string "^7.0.8"