AttributeError: 'super' object has no attribute '__getattr__' in python version 3.10.7 and kivyMD - kivy

Question

what is wrong with my code???
login.py
class NewApp(MDApp):
def build(self):
self.theme_cls.theme_style="Dark"
self.theme_cls.primary_palette="Blue"
self.strng = Builder.load_string(help_str)
i am trying to call this function on the press of the submit button.the function is getting called yet its showing an attribute error
def check_admin(self):
self.id=self.strng.get_screen('adminloginpage').ids.adminid.text
self.adpassword=self.strng.get_screen('adminloginpage').ids.adminpassword.text
the kv code
help_str='''
<AdminloginPage>:
name:'adminloginpage'
BoxLayout:
orientation:'vertical'
size:root.width,root.height
MDLabel:
text:"Admin screen"
font_style:"H4"
halign:'center'
pos_hint:{'center_y':0.9}
size_hint:(0.7,0.1)
MDTextField:
id:'adminid'
halign:'center'
hint_text:'enter admin id '
icon_right:'account'
pos_hint:{'center_x':0.5,'center_y':0.5}
size_hint:(0.7,0.1)
helper_text:'Required'
helper_text_mode:'on_error'
required:True
multiline:False
MDTextField:
id:'adminpassword'
halign:'center'
hint_text:'enter admin password '
icon_right:'eye-off'
pos_hint:{'center_x':0.5,'center_y':0.5}
size_hint:(0.7,0.1)
helper_text:'Required'
helper_text_mode:'on_error'
required:True
password:True
multiline:False
MDTextButton:
text: 'submit'
md_bg_color:app.theme_cls.primary_color
user_font_size:'30sp'
size_hint:(0.9,0.5)
on_press:app.check_admin()'''
i am trying to store the userid and password to validate

Answer 1

the code below is runnable and does not produce the error you listed. An assumption was made that you wanted a ScreenManager so this was installed as the top level widget and just one screen is loaded according to your kivy string. The layout isn't polished but the app should load with the elements present and you can click the button and it will print the password to the console.
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
from kivy.lang import Builder
# kivymd
from kivymd.app import MDApp
from kivymd.uix.screenmanager import ScreenManager
from kivymd.uix.screen import MDScreen
help_str='''
<AdminloginPage>:
name:'adminloginpage'
BoxLayout:
orientation:'vertical'
size:root.width,root.height
MDLabel:
text:"Admin screen"
font_style:"H4"
halign:'center'
pos_hint:{'center_y':0.9}
size_hint:(0.7,0.1)
MDTextField:
id: adminid
halign:'center'
hint_text:'enter admin id '
icon_right:'account'
pos_hint:{'center_x':0.5,'center_y':0.5}
size_hint:(0.7,0.1)
helper_text:'Required'
helper_text_mode:'on_error'
required:True
multiline:False
MDTextField:
id: adminpassword
halign:'center'
hint_text:'enter admin password '
icon_right:'eye-off'
pos_hint:{'center_x':0.5,'center_y':0.5}
size_hint: 0.7, 0.1
helper_text:'Required'
helper_text_mode:'on_error'
required:True
password:True
multiline:False
MDTextButton:
text: 'submit'
md_bg_color:app.theme_cls.primary_color
user_font_size:'30sp'
size_hint: 0.9, 0.5
on_press:app.check_admin(self)
'''
class AdminloginPage(MDScreen):
def __init__(self, **kw):
super().__init__(**kw)
class NewApp(MDApp):
def check_admin(self, my_button, *args, **kwargs):
self.id = self.top_level_widget.get_screen('adminloginpage').ids.adminid.text
self.adpassword = self.top_level_widget.get_screen('adminloginpage').ids.adminpassword.text
print(f"password: '{self.adpassword}'\napp: {self}\nbutton: {my_button}")
def __init__(self, **kwargs):
super().__init__(**kwargs)
self.top_level_widget = ScreenManager()
self.login_screen = AdminloginPage(name='adminloginpage')
def build(self):
self.theme_cls.theme_style="Dark"
self.theme_cls.primary_palette="Blue"
self.top_level_widget.add_widget(self.login_screen)
print(type(self.top_level_widget))
return self.top_level_widget
if __name__ == '__main__':
Builder.load_string(help_str)
my = NewApp()
my.run()