How to troubleshoot error code C4200 on my printer

Hi, I have a problem with my Kyocera Mita KM-3530 KX copier. It stopped working midway with a message showing error code C4200 along with a symbol of telephone with some digits. I tried a solution regarding the machine parts but I don’t think it is a hardware problem. Can you tell me why this is happening? I need some help. Thanks.
