Impossible to synch odoo with google calendar

问题

I've configured my odoo to sync calendar with google calendar with my api client ID and secret. The point is, when I click on the synch button, I've this traceback

Does anyone has had this problem ? It's not a duplicate of the another question. The old one is fixed, it's related to a missing mail template, here, the problem seems to be linked to JSON but I don't know why.

Thanks a lot

来源：https://stackoverflow.com/questions/33822237/impossible-to-synch-odoo-with-google-calendar