File "...\Periodic_Table\main.py", line 178, in OtherScreen
main_box = MDBoxLayout(orientation='vertical', padding=10, spacing=10)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "...\AppData\Local\Programs\Python\Python312\Lib\site-packages\kivymd\uix\behaviors\declarative_behavior.py", line 311, in __init__
super().__init__(**kwargs)
File "...\AppData\Local\Programs\Python\Python312\Lib\site-packages\kivymd\theming.py", line 1663, in __init__
raise ValueError(
ValueError: KivyMD: App object must be initialized before loading root widget. See https://github.com/kivymd/KivyMD/wiki/Modules-Material-App#exceptions