我正在通过私有IP将我的go应用程序连接到cloudsql-mysql。下面是我的代码

package main

import (
    "context"
    "database/sql"
    "fmt"
    "log"
    "net"
    "sync"

    "cloud.google.com/go/cloudsqlconn"
    "github.com/go-sql-driver/mysql"
)

const instanceURI = "%s:%s:%s"

func main(){
    instance := fmt.Sprintf(instanceURI, db.Project, db.GCRegion, db.Instance)
    d, err := cloudsqlconn.NewDialer(context.Background(), cloudsqlconn.WithOptions(cloudsqlconn.WithCredentialsJSON(db.ServiceAccount)))
    if err != nil {
        log.Println(err)
    }
    mysql.RegisterDialContext("cloudsqlconn",
        func(ctx context.Context, addr string) (net.Conn, error) {
            return d.Dial(ctx, instance, cloudsqlconn.WithPrivateIP())
        })
    dbURI := fmt.Sprintf("%s:%s@cloudsqlconn(%s)/%s?parseTime=true",
        db.User, db.Password, instance, db.DbName)
    dbPool, err := sql.Open("mysql", dbURI)
    if err != nil {
        log.Println(err.Error())
        
    }
    err = dbPool.PingContext(context.Background())
    if err != nil {
        log.Printf("Errors %s pinging DB", err)
    }

}

我得到了下面的错误。
unexpect resp from server for caching_sha2_password perform full authentication
有人能帮我解释一下错误的原因吗？
我按照下面的文档https://cloud.google.com/sql/docs/mysql/connect-connectors