return error fix for coroutines

commands.lua

@@ -1210,10 +1210,10 @@ end
 
 local cmd_get_player = function(data,pname) -- return player for further manipulation
 	local player = minetest.get_player_by_name(pname)
-	if not player then return end
+	if not player then error("player does not exist"); return end
 	local spos = data.spawnpos;
 	local ppos =  player:getpos();
-	if not is_same_block(ppos,spos) then return end
+	if not is_same_block(ppos,spos) then error("can not get player in another protection zone") return end
 	return player	
 end
 
@@ -1222,7 +1222,7 @@ local cmd_get_player_inv = function(data,pname)
 	if not player then return end
 	local spos = data.spawnpos;
 	local ppos =  player:getpos();
-	if not is_same_block(ppos,spos) then return end
+	if not is_same_block(ppos,spos) then error("can not get player in another protection zone") return end
 	return player:get_inventory();
 end
 

init.lua

@@ -732,7 +732,7 @@ local function runSandbox( name)
 	local cor = data.cor;
 	if cor then -- coroutine!
 		local err,ret
-		err,ret = coroutine.resume(cor)
+		ret,err = coroutine.resume(cor)
 		if err then return err end
 		return nil
 	end
@@ -1571,7 +1571,7 @@ minetest.register_on_player_receive_fields(
 			if fields.OK and fields.code then
 				local item = player:get_wielded_item(); --set_wielded_item(item)
 				if string.len(fields.code) > 1000 then 
-					minetest.chat_send_player(player,"#ROBOT: text too long") return 
+					minetest.chat_send_player(player:get_player_name(),"#ROBOT: text too long") return 
 				end
 				item:set_metadata(fields.code);
 				player:set_wielded_item(item);

scripts/games/sliding_puzzle_game.lua

@@ -1,10 +1,11 @@
 -- sliding unscramble game by rnd, made in 20 minutes
 if not init then
+	reward = "default:gold_ingot"
+	size = 3;
+
 	init = true
 	spos = self.spawnpos(); spos.y = spos.y + 1
 	board = {};
-	size = 3;
-	
 	local players = find_player(4);
 	if not players then say("#sliding puzzle game: no players") self.remove() end
 	name = players[1];
@@ -92,7 +93,6 @@ if event and event.y == spos.y then
 		if score >= size*size-2 then
 			minetest.chat_send_player(name, "CONGRATULATIONS! YOU SOLVED PUZZLE. REWARD WAS DROPPED ON TOP OF ROBOT.") 
 			pos = self.pos(); pos.y = pos.y+2;
-			reward = "default:gold_ingot"
 			minetest.add_item(pos, _G.ItemStack(reward))
 			self.remove()
 		end