Letsencrypt ssl with Cloudflare dns challenge not working, internal error solved

[hackerd2501]

I installed npm and wanted to add letsencrypt certificates for my Domain with a dns challenge to my Domain on cloudflare dns servers.

I generated a dns:edit cloudflare token on my cloudflare account and started the generate ssl process in npm. I selected cloudflare and got back two fields to fill out:
cloudflare_dns_email and cloudflare_dns_api_key. I entered my entries, clicked on save and got an internal error.

After long google searches and tryouts I found out how to do it:

1. Comment out the cloudflare_dns_email
2. Change cloudflare_dns_api_key to cloudflare_dns_api_token and fill in token
   With this config it works.

Error screenshot:

Corrected config: