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(XID ymyzxc) You do not have the feature “sslinstall”.
I ran into this issue and found that the cpanel account itself didn’t have the ability to install the SSL that Let’s Encrypt generates. To fix it log in to WHM and go to the feature manager:
WHM >> Packages >> Feature Manager
Then edit whatever feature list your site is using, if it just shows “default” that’s fine, just choose that.
In the list it gives you, look for “SSL Host Installer“ and check that if it’s not already. You might want to review the rest of the settings as well but if everything looks good, then save the changes and try to generate the SSL again.
Let me know if that works or if you continue to have any other problems after that.