symfony 連接redis集群出錯：如下

Warning: call_user_func_array() expects parameter 1 to be a valid callback, no array or string given

我使用的第三方bundle

"snc/redis-bundle": "2.*",
"predis/predis": "^1.0"

這是我的配置

snc_redis:
clients:
default:
type: predis
alias: default
dsn: redis://192.168.74.132:6380
logging: %kernel.debug%
cache:
type: predis
alias: cache
dsn: redis://192.168.74.132:6381
options:
profile: 2.2
connection_timeout: 10
read_write_timeout: 30
cluster:
type: predis
alias: cluster
dsn:
- redis://192.168.74.132:6380
- redis://192.168.74.132:6381
- redis://192.168.74.132:6382
- redis://192.168.74.132:6383
- redis://192.168.74.132:6384
- redis://192.168.74.132:6385

單個redis連接沒有問題，cluster連接出錯，不知道是那兒出了錯誤，我渴望得到幫助。