I too have had this issue in the past and occasionally when I am charging lipo batteries and normally I follow this process:, check your connections, make sure you use a balancing block(and have it connected the right way around and using the correct port) and have the correct charging setting.
What charger are you using??? As I use the venom ac/dc charger and have no issues, but have used a thunder power rc charger and had nothing but that error until I took it back and exchanged for the venom.