Cannot write Log file

[NguyenHoangMinhkkkk]

Hi there. im making a Application which is running as a Windows Serivce.
The Application working fine on development, but when i try to run it as install and start running as a Windows Serivce,
The Application cannot write log file.

Env:
Window server 2016
Golang version lastest
gopkg.in/natefinch/lumberjack.v2 v2.2.1
github.com/kardianos/service v1.2.2

Steps:
run build with command: GOOS=windows GOARCH=amd64 CGO_ENABLED=1 go build -ldflags="-w -s"
run install service with cmd: E:\GoLang\Project\TestApp.exe install
run start service with cmd: E:\GoLang\Project\TestApp.exe start => Error: Failed to start iLotusLand-Watchman-Go-v2: An instance of the service is already running

The service is running now, can see it in Services, and TaskManager
and The service Log on as Local system account

If i run it by just double click on .exe file, the log file are writing normally
but no output logfile when the it running as a Windows service

package main

import (
	"fmt"
	"io"
	"log"
	"os"
	"path/filepath"
	"strings"
	"time"
	"github.com/kardianos/service"
	"gopkg.in/natefinch/lumberjack.v2"
)

type program struct{}
var logger service.Logger

func (p *program) Start(s service.Service) error {
	go p.run()
	return nil
}

func (p *program) run() {

	if err != nil {
		fmt.Println("Error:", err)
		fmt.Println("Press any key to exit...")

		fmt.Scanln()

		os.Exit(0)
		return
	}

	SetupLog()

	log.Println("===========TEST LOG=========") // write into txt log file 
	log.Println("===========TEST LOG=========")
	log.Println("===========TEST LOG=========")
	log.Println("===========TEST LOG=========")
}

func (p *program) Stop(s service.Service) error {
	return nil
}

func SetupLog() {
	LOG_FOLDER := "E:\\LOG_FOLDER"
	fileName := "file-log" + time.Time.Format(time.Now(), "-2006-01-02") + ".txt"
	
	filePath := filepath.Join(LOG_FOLDER, fileName) 
	// E:\\LOG_FOLDER\\file-log-2024-09-25.txt

	lumberjackLogger := &lumberjack.Logger{
		Filename:   filepath.ToSlash(filePath),
		MaxSize:    2,
		MaxBackups: 10000,
		MaxAge:     30,
		Compress:   false,
	}

	multiWriter := io.MultiWriter(os.Stderr, lumberjackLogger)

	log.SetOutput(multiWriter)
}

func main() {
	svcConfig := &service.Config{
		Name:        "ServiceName",
		DisplayName: "ServiceName",
		Description: "ServiceName",
	}

	prg := &program{}
	s, errS := service.New(prg, svcConfig)
	if errS != nil {
		log.Fatal(errS)
	}

	service.Control(s, "start")

	if len(os.Args) > 1 {
		errS := service.Control(s, os.Args[1])
		if errS != nil {
			fmt.Println("Error:", errS)
			os.Exit(1)
		}
		os.Exit(0)
	}

	errS = s.Run()

	if errS != nil {
		log.Println(errS)
	}
}