Send different message for not having enough items/money

src/main/java/com/alttd/playershops/shop/PlayerShop.java

@@ -252,7 +252,7 @@ public class PlayerShop {
 
         int playerItems = InventoryUtils.countItems(player.getInventory(), itemStack);
         if (playerItems < itemStack.getAmount())
-            return TransactionError.INSUFFICIENT_FUNDS_PLAYER;
+            return TransactionError.INSUFFICIENT_ITEMS_PLAYER;
 
         boolean hasFunds = EconomyUtils.hasSufficientFunds(this, price);
         if (!hasFunds)

src/main/java/com/alttd/playershops/shop/TransactionError.java

@@ -4,6 +4,7 @@ public enum TransactionError {
     CANCELLED,
     INSUFFICIENT_FUNDS_SHOP,
     INSUFFICIENT_FUNDS_PLAYER,
+    INSUFFICIENT_ITEMS_PLAYER,
     INVENTORY_FULL_SHOP,
     INVENTORY_FULL_PLAYER,
     PLAYER_OFFLINE,