Just wondering, since I had similar happen on my ZS. Did you have the car fully started before trying to take the brake off?
I had just finished charging mine a while back, and after taking the cable off, I jumped into the car, but forgot to press the start button with foot on the pedal (I'd been instandby whilst charging). The car might look like it's ready to go, but the HV battery is disconnected, so it will allow the brakes to come off, but there will be no drive, brake or steering assistance. Not always easy to see the ready light or the HV pack warning light if the lighting is right ?