I updated the Collector app on my i-pad and now I get this error message: “Map Download Failed. Unable to download the map. Unable to export tiles. Tiles available only for this level(s) [16, 17, 18] hence not able to export tiles for this specified levels [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17].”