Failed to evaluate: Failed to get endorsing peers: error getting channel response for channel [mycha

Fabric-sdk-go v1.4.3 client，在一台物理机器上。

使用First-network的例子byfn.sh没做改动。

执行代码：
func query(contract *gateway.Contract,key string) string{
        response,err := contract.EvaluateTransaction("query",key)
        if err != nil{
        fmt.Println(err)
                panic("query failed!!!!!!!!!!!!!!!!!!!!!!")
        }
        return string(response)

}
返回如下错误
Failed to evaluate: Failed to get endorsing peers: error getting channel response for channel [mychannel]: Discovery status Code: (11) UNKNOWN. Description: error received from Discovery Server: failed constructing descriptor for chaincodes: 

拜托！

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