ERROR when opening "Explorer" register

[sbrenner1982]

Release 0.11
Python 3.11
Windows 10 Firefox 120.0.1

When I switch to the "Explorer" register, the browser shows:

"Internal Server Error

The server encountered an internal error and was unable to complete your request. Either the server is overloaded or there is an error in the application."

console log:
2023-12-06 22:44:59 geo_activity_playground.explorer.converters INFO Building explorer tile history from all activities …
2023-12-06 22:44:59 geo_activity_playground.explorer.converters INFO Activity 3910550516679418123 wasn't parsed yet, reading them …
2023-12-06 22:44:59 geo_activity_playground.explorer.converters INFO Extracting tiles from activity 3910550516679418123 …
2023-12-06 22:44:59 geo_activity_playground.explorer.converters INFO Activity 665755070860271319 wasn't parsed yet, reading them …
2023-12-06 22:44:59 geo_activity_playground.explorer.converters INFO Extracting tiles from activity 665755070860271319 …
2023-12-06 22:44:59 geo_activity_playground.explorer.converters INFO Activity 3116701884354287046 wasn't parsed yet, reading them …
2023-12-06 22:44:59 geo_activity_playground.explorer.converters INFO Extracting tiles from activity 3116701884354287046 …
2023-12-06 22:44:59 geo_activity_playground.explorer.converters INFO Activity 2815321982939008029 wasn't parsed yet, reading them …
2023-12-06 22:44:59 geo_activity_playground.explorer.converters INFO Extracting tiles from activity 2815321982939008029 …
2023-12-06 22:44:59 geo_activity_playground.explorer.converters INFO Activity 2057157721423401396 wasn't parsed yet, reading them …
2023-12-06 22:44:59 geo_activity_playground.explorer.converters INFO Extracting tiles from activity 2057157721423401396 …
2023-12-06 22:44:59 geo_activity_playground.explorer.converters INFO Activity 1024879950318135356 wasn't parsed yet, reading them …
2023-12-06 22:44:59 geo_activity_playground.explorer.converters INFO Extracting tiles from activity 1024879950318135356 …
2023-12-06 22:44:59 geo_activity_playground.explorer.converters INFO Activity 4097627365468579779 wasn't parsed yet, reading them …
2023-12-06 22:44:59 geo_activity_playground.explorer.converters INFO Extracting tiles from activity 4097627365468579779 …
2023-12-06 22:44:59 geo_activity_playground.explorer.converters INFO Activity 722687832335573953 wasn't parsed yet, reading them …
2023-12-06 22:44:59 geo_activity_playground.explorer.converters INFO Extracting tiles from activity 722687832335573953 …
2023-12-06 22:44:59 geo_activity_playground.explorer.converters INFO Activity 1915198705200252476 wasn't parsed yet, reading them …
2023-12-06 22:44:59 geo_activity_playground.explorer.converters INFO Extracting tiles from activity 1915198705200252476 …
2023-12-06 22:44:59 geo_activity_playground.explorer.converters INFO Activity 131465637476262493 wasn't parsed yet, reading them …
2023-12-06 22:44:59 geo_activity_playground.explorer.converters INFO Extracting tiles from activity 131465637476262493 …
2023-12-06 22:44:59 geo_activity_playground.explorer.converters INFO Activity 845606888006357819 wasn't parsed yet, reading them …
2023-12-06 22:44:59 geo_activity_playground.explorer.converters INFO Extracting tiles from activity 845606888006357819 …
2023-12-06 22:44:59 geo_activity_playground.explorer.converters INFO Activity 3464218740280590283 wasn't parsed yet, reading them …
2023-12-06 22:44:59 geo_activity_playground.explorer.converters INFO Extracting tiles from activity 3464218740280590283 …
2023-12-06 22:44:59 geo_activity_playground.explorer.converters INFO Activity 2444638013619293738 wasn't parsed yet, reading them …
2023-12-06 22:44:59 geo_activity_playground.explorer.converters INFO Extracting tiles from activity 2444638013619293738 …
2023-12-06 22:44:59 geo_activity_playground.explorer.converters INFO Activity 2509769455157063981 wasn't parsed yet, reading them …
2023-12-06 22:44:59 geo_activity_playground.explorer.converters INFO Extracting tiles from activity 2509769455157063981 …
2023-12-06 22:44:59 geo_activity_playground.explorer.converters INFO Activity 1818155451184888134 wasn't parsed yet, reading them …
2023-12-06 22:44:59 geo_activity_playground.explorer.converters INFO Extracting tiles from activity 1818155451184888134 …
2023-12-06 22:44:59 geo_activity_playground.explorer.converters INFO Consolidating explorer tile history …
2023-12-06 22:44:59 geo_activity_playground.explorer.converters INFO Store explorer tile history to cache file …
2023-12-06 22:44:59 geo_activity_playground.explorer.clusters INFO Loading explorer cluster state …
2023-12-06 22:44:59 geo_activity_playground.explorer.clusters INFO Compute new explorer cluster state …
2023-12-06 22:44:59 geo_activity_playground.explorer.clusters INFO Saving explorer cluster state …
2023-12-06 22:44:59 geo_activity_playground.explorer.grid_file INFO Generate data for explorer tile map …
2023-12-06 22:44:59 geo_activity_playground.explorer.clusters INFO Load explorer square state …
2023-12-06 22:44:59 geo_activity_playground.explorer.clusters INFO Compute new explorer square state …
2023-12-06 22:44:59 geo_activity_playground.explorer.clusters INFO Save explorer square state …
2023-12-06 22:44:59 geo_activity_playground.explorer.grid_file INFO Generate border tiles …
2023-12-06 22:44:59 geo_activity_playground.webui.app ERROR Exception on /explorer/14 [GET]
Traceback (most recent call last):
File "C:\envs\311\Lib\site-packages\flask\app.py", line 1455, in wsgi_app
response = self.full_dispatch_request()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\envs\311\Lib\site-packages\flask\app.py", line 869, in full_dispatch_request
rv = self.handle_user_exception(e)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\envs\311\Lib\site-packages\flask\app.py", line 867, in full_dispatch_request
rv = self.dispatch_request()
^^^^^^^^^^^^^^^^^^^^^^^
File "C:\envs\311\Lib\site-packages\flask\app.py", line 852, in dispatch_request
return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\envs\311\Lib\site-packages\geo_activity_playground\webui\app.py", line 60, in explorer
"explorer.html.j2", **explorer_controller.render(int(zoom))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\envs\311\Lib\site-packages\geo_activity_playground\webui\explorer_controller.py", line 62, in render
"plot_cluster_evolution": plot_cluster_evolution(
^^^^^^^^^^^^^^^^^^^^^^^
File "C:\envs\311\Lib\site-packages\geo_activity_playground\webui\explorer_controller.py", line 94, in plot_cluster_evolution
.to_json(format="vega")
^^^^^^^^^^^^^^^^^^^^^^
File "C:\envs\311\Lib\site-packages\altair\vegalite\v5\api.py", line 1042, in to_json
spec = self.to_dict(
^^^^^^^^^^^^^
File "C:\envs\311\Lib\site-packages\altair\vegalite\v5\api.py", line 2975, in to_dict
return super().to_dict(
^^^^^^^^^^^^^^^^
File "C:\envs\311\Lib\site-packages\altair\vegalite\v5\api.py", line 961, in to_dict
vegalite_spec = super(TopLevelMixin, copy).to_dict( # type: ignore[misc]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\envs\311\Lib\site-packages\altair\utils\schemapi.py", line 961, in to_dict
result = _todict(
^^^^^^^^
File "C:\envs\311\Lib\site-packages\altair\utils\schemapi.py", line 477, in _todict
return {k: _todict(v, context) for k, v in obj.items() if v is not Undefined}
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\envs\311\Lib\site-packages\altair\utils\schemapi.py", line 477, in
return {k: _todict(v, context) for k, v in obj.items() if v is not Undefined}
^^^^^^^^^^^^^^^^^^^
File "C:\envs\311\Lib\site-packages\altair\utils\schemapi.py", line 473, in _todict
return obj.to_dict(validate=False, context=context)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\envs\311\Lib\site-packages\altair\utils\schemapi.py", line 961, in to_dict
result = _todict(
^^^^^^^^
File "C:\envs\311\Lib\site-packages\altair\utils\schemapi.py", line 477, in _todict
return {k: _todict(v, context) for k, v in obj.items() if v is not Undefined}
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\envs\311\Lib\site-packages\altair\utils\schemapi.py", line 477, in
return {k: _todict(v, context) for k, v in obj.items() if v is not Undefined}
^^^^^^^^^^^^^^^^^^^
File "C:\envs\311\Lib\site-packages\altair\utils\schemapi.py", line 473, in _todict
return obj.to_dict(validate=False, context=context)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\envs\311\Lib\site-packages\altair\vegalite\v5\schema\channels.py", line 64, in to_dict
raise ValueError(
ValueError: Unable to determine data type for the field "time"; verify that the field name is not misspelled. If you are referencing a field from a transform, also confirm that the data type is specified correctly.
2023-12-06 22:44:59 werkzeug INFO 127.0.0.1 - - [06/Dec/2023 22:44:59] "GET /explorer/14 HTTP/1.1" 500 -
2023-12-06 22:45:00 werkzeug INFO 127.0.0.1 - - [06/Dec/2023 22:45:00] "GET /favicon.ico HTTP/1.1" 404 -

[sbrenner1982]

Checking Revision 0.10.0, there is no error.

[martin-ueding]

I've fixed that in 0.12.0, which I just released.