new Service的时候报错

[pasBone]

var Service=require('node-zookeeper-dubbo');
var opt={
gruop:'dubbo', // dubbo group default by 'dubbo',optional
conn:'192.168.2.138:20880', // zookeeper url
path:'com.service.dubbo.provider.ParamService', // service url
}
var service = new Service(opt);
在 new Service的时候报错了:
throw new assert.AssertionError({^
AssertionError: connectionString must be an non-empty string.
请问是什么原因呢?

[hoefershen]

同样的原因，不知道啥问题