I got the same problem as thread starter Error: 699 Harvesting limit hit.
Yesterday harvesting worked I suppose because it was the first time I tried. I clicked the started harvesting button and I got no error messages so I think harvesting started. Should there happen something special while harvesting that notifies me that I am doing harvesting? The only thing I noticed is that “Start delegated harvesting” button changed to “Stop delegated harvesting” Shouldnt my number of XEM:s increase if I have done harvesting?