Error new symfony 3.3.3

| Q                | A
| ---------------- | -----
| Bug report?      | yes
| Feature request? | no
| BC Break report? | no
| RFC?             | no
| Symfony version  | 3.3.3

I have this error when scaffolding new symfony project (3.3.3):

![capture du 2017-07-05 12-13-18](https://user-images.githubusercontent.com/3883583/27860125-6e23675a-617b-11e7-8517-7637fe8b18a9.png)

Thank you !
