The printer has encountered a printing error and by mistake the slide which unlocks the cover has been switched into open position. You will need to turn the slider back so the printer will reset. Also, in its position (open), raise the cover and turn on the printer because it will enter in maintenance mode and while it’s open turn the printer off and wait for the heads to go to their position and try to print again. Make sure the ink level is at optimum before printing (you can check this into the Control Center of the printer software).
