Html validation error on Blocs form

Hello all. Just completed a website project. It’s not live as yet, but you can view the website here:

Before calling it complete, I ran all the CSS and HTML through online validators. I ran into an error on the Blocs-built form on the Contact page. The error indicates that the SUCCESS and FAIL messages are not allowed where Blocs puts them by default. Anyone know how to resolve this? @Norm?

Thanks in advance for any feedback or help.