AttributeError: 'FrozenImporter' object has no attribute 'filename'

Question

I keep getting the following error when running the exe file generated from plotly-dash codes using PyInstaller.

AttributeError: 'FrozenImporter' object has no attribute 'filename'

Did some in-depth check, only able to identify the attribute error happened when dash is trying to import dash_renderer and retrieving the filename from the line package.filename

Tried adding the following but still unable to resolve

1. added import dash_renderer to my codes
2. copied dash and dash_renderer package folders into dist/{app}/ folder

My plotly-dash codes

external_stylesheets = ['https://codepen.io/chriddyp/pen/bWLwgP.css']

app = dash.Dash(__name__, external_stylesheets=external_stylesheets)

app.layout = html.Div(children=[
    html.H2(children='H-{} Meeting Dashboard'.format("SS"), style={'text-align':'center'}),
    html.Div(children=[
        html.Div('''Generated on {}'''.format(str(datetime.now())[:19]), style={'text-align':'center', 'font-size':'15px'})
        ], className='row')]
    )

if __name__ == "__main__":
    app.run_server(debug=True)

PyInstaller Codes used to generate the exe file

\path\to\python37\python.exe -m PyInstaller app_short.py

Error when running the .exe file, run into error below

my\directory>app_short.exe
2019-06-25 23:36:55 Imported all modules
Traceback (most recent call last):
  File "app_short.py", line 24, in <module>
  File "site-packages\dash\dash.py", line 1476, in run_server
  File "site-packages\dash\dash.py", line 1361, in enable_dev_tools
  File "site-packages\dash\dash.py", line 1359, in <listcomp>
AttributeError: 'FrozenImporter' object has no attribute 'filename'
[16716] Failed to execute script app_short

Running the app_short.py file was able to launch the flask app properly and the html page could be access, but the exe kept showing AttributeError.

\my\directory>app_short.py
2019-06-25 23:56:47 Imported all modules
Running on http://127.0.0.1:8050/
Debugger PIN: 313-047-004
 * Serving Flask app "app_short" (lazy loading)
 * Environment: production
   WARNING: Do not use the development server in a production environment.
   Use a production WSGI server instead.
 * Debug mode: on
2019-06-25 23:56:51 Imported all modules
Running on http://127.0.0.1:8050/
Debugger PIN: 074-068-565

How do I fix this error?

Answer 1

I encountered the same error message, and I resolved it by changing

if __name__ == "__main__":
    app.run_server(debug=True)

to

if __name__ == "__main__":
    app.run_server(debug=False)

Not sure why this happens or if running with debug=False is even possible for your needs! Maybe someone else can elaborate?