The brake cut-off circle sign is showing on top of screen
The brake cut-off sensors are not properly installed or adjusted on brake levers.
To let the system rub, unplug the brake sensors from main controller.
Test the motor, then try re-installing or re-adjusting the brake sensors one connected at a time.
Follow installation manual or related video.
Motor cable connection is loose or arrows not aligned. Check and press both waterproof connectors in the line between motor and controller