Hey guys,
had the same issue with the same error and fixed like this:
- disable yourdomain.com proxy on cloudflare.
- go to your control panel in about a min or 2 then issue the certificate manually. DO not check the box saying Use Lets Encrypt to obtain SSL certificate just check the box Enable SSL for this domain .
- Click on the link says / Generate Self-Signed SSL Certificate and issue it manually.
- New window pops up and fill in your EMAIL only and click apply or save. A new lines of 3 certificates will be issued. Copy top one to SSL Certificate and middle one to SSL Key by leaving the last one empty VERY IMPORTANT .
Viola, your SSL for the domain is issued
Hope one works coz I had to do the operation over and over without any success except the way I did it above mentioned.
Good luck,