I also bet on the grinder itself. If it still works, but does not transport ground beans to the brewing group ... unfortunately you will have to disassemble the machine and clean the grinder accordingly. It's not really witchcraft ... but it takes some work. The beans come dry into the brewing group...if for some reason moisture got into the grinder, it is possible that the dry beans developed into a pulp and thus clog the grinder or the transition to the brewing group. The machine's sensors do not register ground beans and this is where the message comes from.
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