I have a domain on cloudflare dns. I wanted to add letsencrypt certificates with cloudflare dns challenge and got an internal error.
When I specified dns challenge and cloudflare as provider I got an additional box with 2 parameters to fill out:
cloudflare_dns_email and cloudflare_dns_api_key.
I entered my email and my cloudflare generated dns:edit token and got an internal error.
Later I found out how to do it right:
You have to comment out or delete cloudflare_dns_email and replace cloudflare_dns_api_key with cloudflare_dns_api_token.
Then it works.


