online shopping under the subdomain “”, is not working

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I have my online shop, installed with the basic free Prestashop Theme, under my primary domain, “”, for about 5 months. I am developing the shop myself, with the help and guidance of your support team, and I have organized the categories, registered suppliers, carriers, products, its attributes, features, pricing and so on.
At this point, I am ready to upgrade the Prestashop to a new and definitively professional “theme”, and was told that to be safe, I should develop an independent online shop, into another domain, indeed a subdomain, which has been created, as “”. A clone of my current online shop, has been installed under the “”, and I intend to develop the new shop with all the necessary tools, modules etc.
Now, when I enter, I got a warning on the top:
… and on the screen the icon … and then a text: Your connection is not private
Attackers might be trying to steal your information from (for example, passwords, messages, or credit cards). NET::ERR_CERT_COMMON_NAME_INVALID
The situation:
1. Thankfully my online shop, installed with the basic free Prestashop Theme, under my primary domain, “”, is still working fine.
2. As explained on both, the second and the third paragraph above, the second, independent online shopping under the subdomain “”, is NOT opening at all, as explained above.
***** Could you please advise on how to get it working? *****
Thank you in advance for your much-appreciated help.
Ednei M.
Hello Ednei,

Thank you for contacting us about this SSL error. It looks like you are seeing this error because the main domain has an SSL installed, however the test domain does not. This is fine because the test domain is only for testing purposes. No sensitive data will be exchanged through it. This means you must simply tell your browser to trust the certificate and proceed on to the site. In most browsers, you can click the `Advanced` button to trust the certificate.

Christopher M.