Before you can proceed, please be sure the necessary CAN-SPAM tokens are included in the footer of your email template. Learn more.
Every HubSpot email template requires CAN-SPAM compliance information, so you'll need to either include a Office Location Information module on the email template or the required HubL variables. See a list of required email HubL variables.
If your template has the required module or variables and you are still seeing this error, there is most likely an issue with your HTML/HubL somewhere above the office location information in your template.