TimedProgression - Failed to compile: There is no argument given that corresponds to the required parameter 'initialStockOverride' of 'NPCVendingMachine.AddItemForSale(int, int, int, int, byte, int)' | Line: 731, Pos: 29

The fix for me was to update that line like so(adding the initial stock override):

                    machine.AddItemForSale(entry.sellItem.itemid, entry.sellItemAmount, entry.currencyItem.itemid, 
                                           entry.currencyAmount, machine.GetBPState(entry.sellItemAsBP, entry.currencyAsBP), entry.initialStock);​