[BUG] Multi Page app looking for Module with the same name of the App

[sssaha1989]

Describe your context
The problem only happens for dash>=3.0.3.

dash                 3.0.4

Describe the bug

A multi page application does not start if the name parameter is defined. It is looking for the same name in sys.modules

Expected behavior

The app should work - the problem does not show up for any version <=3.0.2, The same code that works for dash<=3.0.2 does not work for version >=3.0.3

Screenshots

If applicable, add screenshots or screen recording to help explain your problem.
App definition:

cache = diskcache.Cache(str(cache_path))
background_callback_manager = DiskcacheManager(cache, cache_by=[lambda: uuid.uuid4()], expire=300)
app = dash.Dash(
    name='DER Commissioning Procedure and Toolkit (DERCoPT)',
    background_callback_manager=background_callback_manager,
    use_pages=True,
    suppress_callback_exceptions=True,
    url_base_pathname='/dercopt/',
)

If I do not define the name parameter - the issue goes away. Am I missing something fundamental?

[T4rk1n]

Already fixed by #3315, but name is not something you put anything else than __name__, it is only used for path resolution. You probably want title instead.

[sssaha1989]

Understood - but it seems like it triggers a different problem while trying to create the exe using pyinstaller (unfortunately - I need to provide executables )

It works if I define the name parameter. if I keep the name parameter as name, then running the exe shows this issue

Traceback (most recent call last):
File "app.py", line 53, in
File "dash\dash.py", line 470, in init
File "dash_configs.py", line 137, in pages_folder_config
dash.exceptions.InvalidConfig: A folder called pages does not exist. If a folder for pages is not
required in your application, set pages_folder="". For example:
app = Dash(__name__, pages_folder="")
[PYI-109880:ERROR] Failed to execute script 'app' due to unhandled exception!

I have the pages folder colocated in the same location where I have the exe.

[sssaha1989]

Actually this is a problem in DASH 2.18.2 also - if I do not define the name parameter to something explicit - upon creating the executable DASH fails to find the pages folder - not sure what is happening in the backend..