Initialization - Error: bot not found

[TommasoCere]

This is my main function.
My problem is var that always return nill.

const TELEGRAM_APITOKEN = "MYTOKENfromBOTFATHER"

func setTelegramBot() {
	bot, err := tgbotapi.NewBotAPI(os.Getenv(TELEGRAM_APITOKEN)) //Problem
	fmt.Println(bot)           // output: <nil>
	if err != nil {
		log.Fatal(err)     // output: Not Found
	}
	bot.Debug = true
	updateConfig := tgbotapi.NewUpdate(0)
	updateConfig.Timeout = 60
	msg := tgbotapi.NewMessage(0, "Hello World")
	if _, err := bot.Send(msg); err != nil {
		log.Fatal(err)
	}
}

What i'm forgetting

[myandin]

func setTelegramBot() {
bot, err := tgbotapi.NewBotAPI("MYTOKENfromBOTFATHER") //<<< NO Problem
fmt.Println(bot) // output:
if err != nil {
log.Fatal(err) // output: Not Found
}
bot.Debug = true
updateConfig := tgbotapi.NewUpdate(0)
updateConfig.Timeout = 60
msg := tgbotapi.NewMessage(0, "Hello World")
if _, err := bot.Send(msg); err != nil {
log.Fatal(err)
}
}