Weather in french : Error: cannot unpack non-iterable NoneType object

Hello,
I installed Mycroft on my fedora 31 to perform tests before installing it on a raspberry pi and home assistant.

some skill like weather doesn’t work I get an error back in skills.log

2019-12-26 13:37:24.553 | ERROR | 17170 | WeatherSkill | Error: cannot unpack non-iterable NoneType object
Traceback (most recent call last):
File “/opt/mycroft/skills/mycroft-weather.mycroftai/init.py”, line 433, in handle_current_weather
today = self.__extract_datetime(“today”)[0]
File “/opt/mycroft/skills/mycroft-weather.mycroftai/init.py”, line 1813, in __extract_datetime
when, text = extract_datetime(text, anchorDate, lang, default_time)
TypeError: cannot unpack non-iterable NoneType object

Thanks for your help.