Make errors from IO be properly printed

IO.lua

@@ -18,7 +18,8 @@ local function get_num_stacks(total_items)
     return math.ceil(total_items / 64)
 end
 
-while true do
+local function main()
+    while true do
         local stacks_stored = d.map(d.filter(chest.list(), function(x) return x ~= nil end), w.to_wyvern_item)
         local items_stored = w.collate_stacks(stacks_stored)
         
@@ -53,4 +54,8 @@ while true do
         end
         
         sleep(conf.sleep_time)
+    end
 end
+
+local ok, err = pcall(main)
+print(w.errors.format(err))