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    LR Classic 7.5 Sync error "bad argument #1 to '?' (number expected, got nil)

    Christophoros67 Level 1

      I have trouble syncing  LR Classic 7.5 with the ipad app and Lightroom CC. 21 pictures are marked with a sync error (the sync arrow with the three dot below) and trying to re-sync doesn't work. The sync information appearing in blue on the upper left shows "syncing 32 photos" but there is no progress whatsoever, and the synchronization of new photos doesn't happen. I have tried deleting the sync.lrdata file several times, and even reinstalled LR Classics, but nothing seems to work.

      I'm on a mac sing High Sierra 10.13.6

      Any idea how to solve this problem?

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