问SCF 的 golang 默认 example 无法运行？

package main

import (
	"context"
	"fmt"

	"github.com/tencentyun/scf-go-lib/cloudfunction"
)

type DefineEvent struct {
	// test event define
	Key1 string `json:"key1"`
	Key2 string `json:"key2"`
}

func hello(ctx context.Context, event DefineEvent) (string, error) {
	fmt.Println("key1:", event.Key1)
	fmt.Println("key2:", event.Key2)
	return fmt.Sprintf("Hello %s!", event.Key1), nil
}

func main() {
	// Make the handler available for Remote Procedure Call by Cloud Function
	cloudfunction.Start(hello)
}

返回结果:
{"errorCode":-1,"errorMessage":"Internal server error"}