Hello! The scenario is a little tricky to describe in words, but if you follow the error warning extremely literally it should point you in the right direction. It describes exactly what is going on and how to fix it.
You need to go to the Settings > General page for the main site you are trying to clone - in this case http://www.rcomienda.com. Then, in the Site Name field you need to change that to something else. It cannot be just "rComienda" by itself because that word is also in the domain name and it will corrupt the new clone because of the automatic replacements that have to happen for the clone site to work properly. Every clone starts out as an exact copy, but you can't have two of the exact same sites (same domains, same folders, etc.). So the Cloner makes intelligent replacements to make the clone's naming unique based on what you put into the settings.
However, it will detect situations like this where corruption will occur.
Just go into Settings > General for http://www.www.rcomienda.com and change the Site Name to something other than "rComienda" - it can be something like "rComienda Main Site" or anything - it just can't only be identical to any part of the domain name by itself. After you make that update it should work just fine.
Hopefully that is more clear now. Regards!