hello @Pierre_Megret, welcome to the community! 
First of all, thanks for coming here and reporting the issue. It seems that it’s something on our end (see the other recent post "Our server encountered an error" on anything in Forest).
It’s tricky as it seems that not all users are impacted by this outage, but we noticed a few minutes ago and are looking into it right now. Please follow the other post for status updates!