I think the problem is with your Common Name field. The software interface that you’re using should probably not even allow you to choose the value for this field; it should probably choose one automatically to avoid this error.
For historical reasons, the Common Name in a certificate needs to be one of the domain names that the certificate covers. In your screenshot, you chose
thuexeotosaigon as the Common Name, but this is not valid because it’s not a complete domain name. Probably you should specify
thuexeotosaigon.fdola.com as the Common Name, or leave this field blank if the interface allows you to do that.
Despite the term Common Name, which sounds like it would mean “informal name” or “short name” or something, the historical practice with certificates requires that it must be a DNS domain name, if it’s present. So I think the problem you’re encountering here is that
thuexeotosaigon, by itself, isn’t a DNS domain name.