Thanks for using our Bitnami WordPress stack! You would need to configure tour new domain in WP configuration as detailed in the following guide:
Apart from that, if you have set your old domain in Apache conf, you will need to update with the new one.
If the error still appears, can you run the bndiagnostic tool and open a new “technical issue” thread here in the forum? Our team is actively monitoring it and will be glad to help you.
Francisco de Paz