Hi Terry,
So for live sites it’s generally recommended to turn the display of errors off – and that would resolve this at least superficially.
That particular error though is really due to an issue within Genesis itself (some users highlighted it a few weeks back) and my understanding is that it is was raised in their (StudioPress’s) own support forum and is being progressed there.
If you are not already using the latest Genesis code therefore it could be worth updating and seeing if that helps, otherwise you’d need to chase this up with the theme author.
Thanks!