Based on my experience I would take a look at the feeder. Maybe the PVA was already worn down and there is some PVA dust in the feeder. I also had the error two times in the past telling me the feeder was out of the filament when there still was plenty on the role. Maybe quickly open the feeder and clean it. Should be a quick thing to check for before doing anything else...
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robinmdh 106
haven't seen anything like this, all I can say is check the material isn't ultimaker PVA iso generic natural PVA if that is what you sliced for, make sure you have a recent firmware version installed and make sure the nozzle is a BB core.
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