Hi and welcome to Justanswer.
Initially, the bean hopper lid has magnet that triggers close and open. If the magnet have not enough power or lost the machine always think that your bean hopper is open. I want you to bypass this magnet on the lid and put other magnet on the socket. Please refer to this link for sample image CLICK HERE. At this moment no need to put your bean hopper cover/lid just the magnet. If the error disappear, you need to replace the magnet found on the lid/cover or you can recharge the magnetic power by putting big and strong magnet attach to the weak magnet found on lid.
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I'm just following up with you to see how everything is going. Did my answer help?
Let me know,Chester