When trying to clear the cache on my symfony2 project, I am getting this error message:

```
PHP Fatal error:  Call to undefined method Symfony\Component\Console\Output\ConsoleOutput::isVerbose() in /var/staging_www/www.sciforum.net/vendor/symfony/symfony/src/Symfony/Bundle/FrameworkBundle/Command/CacheClearCommand.php on line 87

```

Any idea? Thank you.

EDIT:

When trying to update vendors, I am getting this error message: 

```
Clearing the cache for the dev environment with debug true
PHP Fatal error:  Call to undefined method Symfony\Component\Console\Output\ConsoleOutput::isVerbose() in /var/staging_www/www.sciforum.net/vendor/symfony/symfony/src/Symfony/Bundle/FrameworkBundle/Command/CacheClearCommand.php on line 99
Script Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::clearCache handling the post-update-cmd event terminated with an exception

[RuntimeException]
An error occurred when executing the "'cache:clear --no-warmup'" command.

```