Ошибка при выполнении команды php composer.phar install

Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::clearCache
[Symfony\Component\Debug\Exception\ContextErrorException]                                                                       
Warning: Declaration of Snc\RedisBundle\Client\Phpredis\Client::append() should be compatible with Redis::append($key, $value)  
Script Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::clearCache handling the post-install-cmd event terminated with an exception
[RuntimeException]                                      
An error occurred when executing the "'cache:clear --n  o-warmup'" command:                                                                                 
[Symfony\Component\Debug\Exception\ContextErrorException]                                           
Warning: Declaration of Snc\RedisBundle\Client\Phpredis\Client::append() should be compatible with Redis::append($key, $value)