Workflow can't be activate for UNKNOWN error

I made the following workflow

Each time i’m trying to activate it i have the following error
" Problem
There was a problem and the workflow could not be activated:
UNKNOWN ERROR - check the detailed error for more information"

Do you know why it can appears, how can i do for avoiding it and where i can see the exact log of the error ?
Thank you !

Hey @Leonard!

While building the workflow did you get any errors? If yes, did you fix them?

Hi @harshil1712 !
Thank you for your response
Yes i fix them all, when i click on “Execute Workflow” it works, but activate doesn’t work.

Do you run n8n locally? If so do you use the tunnel?
If you run n8n on a server do you have a proper domain setup with SSL?
Because many services only allow only webhook URLs with domains (no IP addresses) and only via HTTPS.