Previously I used 3 epson wf-7110 with chipless key. At first the machine ran very well. But after a period of use, the error "close ink cartridge cover". Accompanied by error 0x69, the printer cannot work. I switched to using 2 epson wf-7710 with chipless key. At first the machine ran very well. But after a period of use, the error "close ink cartridge cover". Accompanied by the error "034503", the printer cannot work. I don't know what to do, so I should ask the Admin for help. And I am very grateful.