Electrode Cut Failure: This error indicates that during the "Measurements Preparing", there was insufficient contact on one or more connection points (handholds, foot plates, head strap). The User Documentation explains that some people have low conductivity due to dehydration and/or underactivity. You can put some water underneath the contacts on the head strap, as that is the most common source of a lack of connection. Ensure no hair is caught in the head contacts as that is a common cause. Once you do that, restart the hardware and software to be safe.
Note: First, check for a physical cause, such as a loose connection, a break in the cable, or wear and tear.