Flask-Login app: No layout in module pages.login in dash.page_registry

[etjkai]

Hi AnnMarie, running the multi_page_flask_login app example results in an error

dash.exceptions.NoLayoutException: No layout in module pages.login in dash.page_registry

Just highlighting in case you'd like to change it.

[AnnMarieW]

Hi @etjkai Thanks for reporting, but I can't duplicate the error. I ran it just now with both dash 2.5.1 and dash 2.6.0 and they both work just like it appears in the gif in the README.

Could you send me a link to a minimal example that duplicates the error you are seeing? What version of flask and flask_login are you using?

[etjkai]

I've cloned directly from the git repo, and ran app.py from the folder. I've checked, and it seems like my dash version is 2.6.0 too.

Just to check the version of the code, it's still the one with a typo in the subfolder - multi_page_fask_login right?

[AnnMarieW]

I just cloned the repo, created an new venv and installed the requirements.txt and it worked fine.
Did you do the pip install python-dotenv as recommended in the error message?

And thanks for pointing out the typo in the folder name - I just fixed that 🙃

[etjkai]

Yepp I did have python-dotenv installed. I did the exact same steps as you, with a fresh venv, but the same error persists...

It's very strange, as other examples, e.g. multi_page_basics work as intended.

[AnnMarieW]

Here's what I get when I do pip list:
Do you have anything different?

async-timeout 4.0.2
Brotli 1.0.9
click 8.1.3
dash 2.5.1
dash-bootstrap-components 1.2.0
dash-bootstrap-templates 1.0.5
dash-core-components 2.0.0
dash-html-components 2.0.0
dash-iconify 0.1.2
dash-labs 1.1.0
dash-mantine-components 0.10.2
dash-table 5.0.0
Deprecated 1.2.13
diskcache 5.2.1
Flask 2.1.3
Flask-Caching 1.10.1
Flask-Compress 1.12
Flask-Login 0.6.1
importlib-metadata 4.12.0
importlib-resources 5.8.0
itsdangerous 2.1.2
Jinja2 3.1.2
ldap3 2.9.1
MarkupSafe 2.1.1
numpy 1.23.1
packaging 21.3
pandas 1.4.3
pip 20.0.2
pkg-resources 0.0.0
plotly 5.9.0
pyasn1 0.4.8
pyparsing 3.0.9
python-dateutil 2.8.2
python-dotenv 0.20.0
pytz 2022.1
redis 4.3.4
setuptools 44.0.0
six 1.16.0
tenacity 8.0.1
Werkzeug 2.1.2
wrapt 1.14.1
zipp 3.8.1

[etjkai]

I've

• colorama==0.4.5
• dash==2.6.0

and do not have

• pkg-resources 0.0.0

All the rest are the same versions.

[AnnMarieW]

well, I'd love to help, but I'm not sure how without being able to duplicate the error.

[etjkai]

Not an issue! Perplexing to me too, as I'm indeed seeing the layout in page.login right in front of me. Thanks anyway - much appreciated.

[AnnMarieW]

hmm - are you on Windows?

[etjkai]

Yepp - I happen to be!

[AnnMarieW]

ok, just had someone else on Windows try it and they got the same error. I don't know the fix yet, but it's a clue.

[etjkai]

Great! Let me know if I could help in any way - I'd be glad to 😊