[Bug]: ModuleNotFoundError: No module named 'icalendar.windows_to_olson'

[jimmybonesde]

I Have A Problem With:

The integration in general

What's Your Problem

something broke the addon

when i want to add a source or add a ical file i get that error

File "/usr/local/lib/python3.13/concurrent/futures/thread.py", line 59, in run
result = self.fn(*self.args, **self.kwargs)
File "/usr/src/homeassistant/homeassistant/util/loop.py", line 200, in protected_loop_func
return func(*args, **kwargs)
File "/usr/local/lib/python3.13/importlib/init.py", line 88, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "", line 1387, in _gcd_import
File "", line 1360, in _find_and_load
File "", line 1331, in _find_and_load_unlocked
File "", line 935, in _load_unlocked
File "", line 1026, in exec_module
File "", line 488, in _call_with_frames_removed
File "/config/custom_components/waste_collection_schedule/waste_collection_schedule/source/ics.py", line 15, in
from waste_collection_schedule.service.ICS import ICS
File "/config/custom_components/waste_collection_schedule/waste_collection_schedule/service/ICS.py", line 7, in
from icalevents import icalevents
File "/usr/local/lib/python3.13/site-packages/icalevents/icalevents.py", line 3, in
from .icalparser import parse_events, Event
File "/usr/local/lib/python3.13/site-packages/icalevents/icalparser.py", line 18, in
from icalendar.windows_to_olson import WINDOWS_TO_OLSON
ModuleNotFoundError: No module named 'icalendar.windows_to_olson'

no new source can be added

Source (if relevant)

No response

Logs

No response

Relevant Configuration

No response

Checklist Source Error

• Use the example parameters for your source (often available in the documentation) (don't forget to restart Home Assistant after changing the configuration)
• Checked that the website of your service provider is still working
• Tested my attributes on the service provider website (if possible)
• I have tested with the latest version of the integration (master) (for HACS in the 3 dot menu of the integration click on "Redownload" and choose master as version)

Checklist Sensor Error

• Checked in the Home Assistant Calendar tab if the event names match the types names (if types argument is used)

Required

• I have searched past (closed AND opened) issues to see if this bug has already been reported, and it hasn't been.
• I understand that people give their precious time for free, and thus I've done my very best to make this problem as easy as possible to investigate.

[dominikfe]

Same here with HA 2025.1.1

[stefan04]

Same here.
HA 2025.1.1
WasteCollectionSchedule 2.6.0

[ThomPre99]

Same here.
HA 2025.1.1
WasteCollectionSchedule 2.6.0 (also tested with 2.3.0, 2.4.0 and 2.5.0 without success)

The error also occurs on a freshly installed system

[TheBassfly]

Same for me.

[BombusAlpinus]

Same for me too...
HA: 2025.1.1
Integration: 2.6.0
but maybe this is related to this issue: #135077

anyway, thanks for your work @mampfes !

[philipp-luettecke]

I did the "fix" provided in home-assistant/core#135077 and my integration started working again with 2.6.0 and 2025.1.1. So maybe it is not even a misbehavior in the integration but in HA Core instead.
You can check yourself on where the file icalparser.py is located on your system. For me it was /usr/local/lib/python3.13/site-packages/icalevents then just change from icalendar.windows_to_olson import WINDOWS_TO_OLSON to from icalendar.timezone.windows_to_olson import WINDOWS_TO_OLSON and restart HA.

Fixed it for me, but I'm not sure if this has any other implications.
I assume, that there will be a proper fix in HA Core for that.

[TheBassfly]

This only fixed for me for like 1 or two hours. After that the calendar again removed itself with errors.

[udochrist]

This seems to be fixed by today's ha update 2025.1.2. at least I don't get the missing import any more.

However now waste collection has created a new device (as duplicate). Any ideas how to get rid of that?

[DarthSonic]

This seems to be fixed by today's ha update 2025.1.2. at least I don't get the missing import any more.

However now waste collection has created a new device (as duplicate). Any ideas how to get rid of that?

Yes. I have the same issue too. Duplicated device. I disabled the "old ones" as they were unavailable at all. But no way to remove them.

Unfortunately, either Waste Collection Schedule is working OR ICS Calendar. I found no way to fix both integrations.

[stefan04]

This seems to be fixed by today's ha update 2025.1.2. at least I don't get the missing import any more.

No change for me.
Update today to 2025.1.2
But still in the log...

2025-01-10 22:14:29.574 ERROR (SyncWorker_2) [custom_components.waste_collection_schedule.waste_collection_schedule.source_shell] error loading source ics:
No module named 'icalendar.windows_to_olson'

[andreasbrett]

needs to be fixed in upstream library icalevents that is not yet icalendar v6 compatible.

jazzband/icalevents#145