>     from dooit.ui.tui import Dooit
       >   File "{{storeDir}}/lib/python3.11/site-packages/dooit/ui/tui.py", line 17, in <module>
       >     class Dooit(App):
       >   File "{{storeDir}}/lib/python3.11/site-packages/textual/message_pump.py", line 109, in __new__
       >     class_obj = super().__new__(cls, name, bases, class_dict, **kwargs)
       >                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
       >   File "{{storeDir}}/lib/python3.11/site-packages/textual/app.py", line 785, in __init_subclass__
       >     raise ValueError(
       > ValueError: SCREENS should contain a Screen type or callable, not an instance (got instance of MainScreen for 'main')
       For full logs, run 'nix log /nix/store/zs6if1vqlhwk84v45lvkjnnkmihl30fy-dooit-2.2.0-test-version.drv'.