imax b6 balance charging error

[grovehead]

ive bought 3 3 cell lipos and a imax b6 lipo balance charger but it will not charge in balance mode but will normally

the error im getting is vol err cell connect ive noticed that alot of people have had the same problem

im using turnigy 11.1v 3 s 20/30c 2200mah lipos all wires are connected as they sould be

can anyone shed any light on this please