[Python] How to navigate between two pages in XAML and win32more

I want to create a window desktop UI and I am stuck on navigation between tow pages in XAML and win32more so help me to fix this problem. Firstly I create a page using XAML and run this application using win32more.In win32more code I find the button but this code send back a error is button not found so tell me how can i fix this issue.

this is the win32more code.
from win32more.xaml import XamlApplication
from win32more.Microsoft.UI.Xaml import Window
from win32more.Microsoft.UI.Xaml.Controls import Page, Button, Frame
from win32more.Microsoft.UI.Xaml.Markup import XamlReader

class MainPage(Page):
def __init__(self, frame):
super().__init__()
self.frame = frame
try:

with open("page1.xaml", "r") as file:
self.Content = XamlReader.Load(file.read())
if self.content:
print("xaml content loaded succesfuly...")
else:
print("xaml content not loaded..")

except Exception as e:
print(f"cann't load file...{e}")

get_started_button = self.FindName("GetStartedButton")
if get_started_button:
print("Button found!")
get_started_button.Click += self.GetStartedButton_Click
print(get_started_button)
else:
print("button not found")

def GetStartedButton_Click(self, sender, e):


second_page = SecondPage()
self.frame.Navigate(second_page)


class SecondPage(Page):
def __init__(self):
super().__init__()

with open("page2.xaml", "r") as file:
self.Content = XamlReader.Load(file.read())

class App(XamlApplication):
def OnLaunched(self, args):
win = Window()
win.Title = ""
win.ExtendsContentIntoTitleBar = True
win.SetTitleBar(None)
frame = Frame()

main_page = MainPage(frame)
frame.Content = main_page
win.Content = frame

win.Activate()

XamlApplication.Start(App)



this is XAML code.
<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
>
<Grid Background="White">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>

<Image Source="https://gurpreetsingh.aliens.school/whatsapp.png"
Width="450" Height="550" HorizontalAlignment="Center" VerticalAlignment="Top" Margin="0,155,0,0"/>

<StackPanel HorizontalAlignment="Center" VerticalAlignment="Bottom" Margin="0,455,0,0">
<TextBlock Text="Welcome to WhatsApp" FontSize="24" Padding="10" HorizontalAlignment="Center" />
<TextBlock Text="A simple, reliable, and private way to use WhatsApp on your computer." FontSize="13" Padding="10" HorizontalAlignment="Center" Margin="0,2,0,0" />
<Button Name="GetStartedButton" Content="Get Started" Click="GetStartedButton_Click" />
<TextBlock Text="Version 2.2247.3.0" FontSize="14" Padding="10" HorizontalAlignment="Center" Margin="0,15,0,0" />
</StackPanel>
</Grid>
</Page>

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