Still don't remember what the phrase was, but the ground is probably what it was. I think it is because our Honda has a "floating ground." Your comment about that reminded me that on other forums, I've read where they recommended getting a "bonded plug" to plug into an outlet on the generator that solves that problem.
I found this on another forum that was for boaters (sailors?), where one obviously can't install a ground for the generator: "Cheapest fix is to make a neutral/ground bonding plug by running a wire from the ground to the neutral in a new three prong plug. Mark the plug so you will remember what it is. plug this plug into one of your outlets on the generator and the surge protector will see it as grounded."
Here's a link to an article on it.
Generator Ground-Neutral Bonding
Terry