error 6 cliff sensor move to new location all the time

roomba 980 new lithium battery, covered cliff sensors and it continues with ERROR 6 rebooted continues as soon as it starts to leave the docking station it stops and ERROR 6 “move to a new location” I covered the sensors with aluminum foil so IR should have activated. Is it a sensor or is it motherboard issue everything such as charging display all works. Thank you Antonio