[Python] Python self.page.snack_bar doesn't work in Flet

I'm a beginner student and trying to validate my login code showing a snackbar mensage. There are no erros to run, but snackbar doesn't appear. At first a tried if a firebase authentication, and i think that could be wrong and tried with a simple condition, but doesn't work either, condition being right or not.

flet --version 0.27.1

what could be the problem? could someone help me? Thank You.

import flet as ft
from utilis.colors import *
from database.firebase_config import auth_pyrebase


class Login(ft.Container):
def __init__(self, page: ft.Page):
super().__init__()


self.expand = True
self.page = page

self.user = ft.TextField(
label= 'E-mail',
border_color= BorderColor,
width= 400,
)

self.password = ft.TextField(
label= 'Password',
password=True,
can_reveal_password=True,
border_color= BorderColor,
width= 400,
)

self.btn_login = ft.ElevatedButton(
text='Login',
color= TxtColor,
bgcolor=ButtonLoginColor,
width=100,
height= 40,
on_click= self.login,
)

self.btn_singup = ft.ElevatedButton(
text='Sign Up',
color= TxtColor,
bgcolor=ButtonSingupColor,
width=100,
height= 40,
on_click= lambda e: page.go('/singup')
)

self.content = ft.Row(
controls=[
ft.Container(
expand= 1,
padding = ft.padding.all(20),
content = ft.Column(
alignment=ft.MainAxisAlignment.CENTER,
horizontal_alignment=ft.CrossAxisAlignment.CENTER,
controls=[
ft.Text('Login',
color=TxtColor,
size=40,
weight=ft.FontWeight.BOLD),
self.user,
self.password,
self.btn_login,
self.btn_singup,
]
)
)
]
)

def login(self, e):

# try:
# auth_pyrebase.sign_in_with_email_and_password(
# self.usuario.value, self.senha.value)
if self.user.value == 'test' and self.password.value == 'test':
self.page.snack_bar = ft.SnackBar(
ft.Text(
value='Login OK',
color='white',
),
bgcolor='green',
action='OK',
duration=3000,
)
self.page.snack_bar.open = True
self.page.update()
self.user.value = ""
self.password.value = ""

else:
self.page.snack_bar = ft.SnackBar(
ft.Text(
value='Erro',
color='white',
),
bgcolor='red',
action='OK',
duration=3000,
)
self.page.snack_bar.open = True
self.page.update()

self.user.value = ""
self.password.value = ""


I already try to copy a example in Flet Docs, but also doesn't work.

self.page.open(ft.SnackBar(
ft.Text(
value='Login OK!',
bgcolor='green',
action='OK',
duration=3000,
)))


Minimal Reproducible Example

import flet as ft

class Login(ft.Container):
def __init__(self, page: ft.Page):
super().__init__()

self.page = page

self.user = ft.TextField(
label= 'E-mail'
)

self.password = ft.TextField(
label= 'Password',
)

self.btn_login = ft.ElevatedButton(
text='Login',
on_click= self.login,
)

self.content = ft.Row(
controls=[
ft.Container(
content = ft.Column(
controls=[
ft.Text('Login'),
self.user,
self.password,
self.btn_login,
]
)
)
]
)

def login(self, e):

if self.user.value == 'test' and self.password.value == 'test':
self.page.snack_bar = ft.SnackBar(
ft.Text(
value='Login OK',
color='white',
),
bgcolor='green',
action='OK',
)
self.page.snack_bar.open = True
self.page.update()
else:
self.page.snack_bar = ft.SnackBar(
ft.Text(
value='Erro',
color='white',
),
bgcolor='red',
action='OK',
)
self.page.snack_bar.open = True
self.page.update()

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