Sharp AR-163 error after inserting a new cartridge

Hi, after inserting a new cartridge in my Sharp AR-163 copier yesterday, I found a problem with it. It was flashing an error that says U2-40. I then replaced the cartridge but this did not solve the problem. Can you tell me what is causing this error? Please also give me some suggestions and tips on how to fix this problem. I will be waiting for your response.
