Lookup Error when threading multipage app

Dash Python
1

Hi everyone,

This is the most basic version of my code that still doesn’t work. You’ll find the error at the very bottom. I’ve tried everything I can think of, but I can’t figure out why it’s doing this. Please help, or I’m going to lose my job!

if __name__ == "__main__":

    def gui_thread():
        app = Dash(__name__, use_pages=True, pages_folder=r"./main_pages")

        app.run

    thread = threading.Thread(target=gui_thread)
    thread.start()

    while True:
        sleep(3)

Page1 (page2 almost the same)

from pathlib import Path
from time import sleep
import dash
from dash import html

dash.register_page(Path(__file__).stem, path='/')

layout = html.Div([
    html.H1('This is our Archive page'),
    html.Div('This is our Archive page content.'),
])

Error Traceback

Exception in thread Thread-1 (gui_thread):
Traceback (most recent call last):
  File "\Python\Lib\threading.py", line 1073, in _bootstrap_inner
    self.run()
  File "\Python\Lib\threading.py", line 1010, in run
    self._target(*self._args, **self._kwargs)
  File "program_2.0\common_libraries\Gui_related_scripts\usability2_0\main_projectX.py", line 17, in gui_thread
    app = Dash(__name__, use_pages=True, pages_folder=r"./main_pages")
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "program_2.0\.ven4updates\Lib\site-packages\dash\dash.py", line 551, in __init__
    self.init_app()
  File "program_2.0\.ven4updates\Lib\site-packages\dash\dash.py", line 630, in init_app
    self.enable_pages()
  File "program_2.0\.ven4updates\Lib\site-packages\dash\dash.py", line 2184, in enable_pages
    _import_layouts_from_pages(self.config.pages_folder)
  File "program_2.0\.ven4updates\Lib\site-packages\dash\_pages.py", line 444, in _import_layouts_from_pages 
    spec.loader.exec_module(page_module)
  File "<frozen importlib._bootstrap_external>", line 995, in exec_module
  File "<frozen importlib._bootstrap>", line 488, in _call_with_frames_removed
  File "program_2.0\common_libraries\Gui_related_scripts\usability2_0\./main_pages\page1.py", line 6, in <module>
    dash.register_page(Path(__file__).stem, path='/')
  File "program_2.0\.ven4updates\Lib\site-packages\dash\_pages.py", line 308, in register_page
    if context_value.get().get("ignore_register_page"):
       ^^^^^^^^^^^^^^^^^^^
LookupError: <ContextVar name='callback_context' at 0x0000022126391490>

Thanks!!