Attempted to load class "CacheException" from namespace "Symfony\Component\Cache\Adapter"

| Q                | A
| ---------------- | -----
| Bug report?      | yes
| Feature request? | yes/no
| BC Break report? | yes/no
| RFC?             | yes/no
| Symfony version  | 2.8

Did you forget a "use" statement for
https://github.com/symfony/cache/blob/v3.2.2/Adapter/FilesystemAdapter.php#L81