Tested and fixed #155

* Also fixed a typo in the game_tibiafiles module.

modules/game_tibiafiles/tibiafiles.lua

@@ -37,7 +37,7 @@ function load()
     addEvent(function() messageBox:raise() messageBox:focus() end)
 
     disconnect(g_game, { onProtocolVersionChange = load })
-    g_game.setprotocolVersion(0)
+    g_game.setProtocolVersion(0)
     connect(g_game, { onProtocolVersionChange = load })
   end
 end

src/otclient/game.cpp

@@ -1054,7 +1054,7 @@ void Game::buyItem(const ItemPtr& item, int amount, bool ignoreCapacity, bool bu
 {
     if(!canPerformGameAction() || !item)
         return;
-    m_protocolGame->sendBuyItem(item->getId(), item->getSubType(), amount, ignoreCapacity, buyWithBackpack);
+    m_protocolGame->sendBuyItem(item->getId(), item->getCountOrSubType(), amount, ignoreCapacity, buyWithBackpack);
 }
 
 void Game::sellItem(const ItemPtr& item, int amount, bool ignoreEquipped)

src/otclient/item.cpp

@@ -216,9 +216,9 @@ int Item::getSubType()
 {
     if(isSplash() || isFluidContainer())
         return m_countOrSubType;
-    if(m_countOrSubType > 0 && g_game.getProtocolVersion() >= 870)
+    if(g_game.getProtocolVersion() >= 900)
-        return 1;
+        return 0;
-    return 0;
+    return 1;
 }
 
 int Item::getCount()