Why set() return syntax error?

[qianqinpan]

my code is here:

rdb := redis.NewClient(&redis.Options{
Addr: "192.168.1.209:6379",
Password: "", // no password set
DB: 0, // use default DB
})
str,err:=rdb.Ping(ctx).Result()
e.Logger.Infof("redis Ping result：%s,%v",str,err)

p1 := &Payload{
	0, "success", time.Now().Unix(), "xxx",
}
body1, _ := json.Marshal(p1)
err = rdb.Set(ctxRob, "startCharge", string(body1), -1).Err()
if err != nil {
	e.Logger.Error("save data error %v", err)
}

the err is : ERR syntax error