can't make text to speech to mp3

[bobwatcherx]

flet NOT made me an mp3 file from text to speech gTTS when I run it the mp3 file is there. but looks empty is there a solution?

from flet import * 
from gtts import gTTS
import os





def main(page:Page):
	audio = Audio()
	txtmain = TextField(label="text to speech")
	def speakfun(e):
		try:
			language = 'id'
			myobj = gTTS(text="hello guys i am from india", lang=language, slow=False)
		except Exception as e:
			print("Failed",e)
		else:
			res = myobj.save("welcome.mp3")
			# zos.system("mpg123 welcome.mp3")
		
	page.add(
		Column([
				txtmain,
				ElevatedButton("Speak",
				bgcolor="orange",
				on_click=speakfun
					)

				])

			)
flet.app(target=main)