I'm trying to make a Smelting Touch with Skript, associated with TuSKe. I tried to make the pickaxe have a chance to get the Smelting Touch "Enchantment" (A Lore With Unbreaking 1), and when I try to change the item that got enchanted's Lore, the script prints this problem when reloading it:

Code (Text):

1. [Server] Server thread/ERROR the lore of event-item stack can't be set to anything (smeltingtouch.sk, line 19: set lore of event-item to "&7Smelting Touch"')
2. [Server] Server thread/ERROR event-item stack cannot be changed, thus it cannot be (dis)enchanted (smeltingtouch.sk, line 21: enchant event-item with unbreaking 1')
3. [Server] Server thread/INFO Encountered 2 errors while reloading smeltingtouch.sk!

The script:

Code (Text):

1. on mine of iron ore:
2.     if player's tool is a pickaxe with lore "&7Smelting Touch":
3.         clear drops
4.         set {drop} to location of target block of player
5.         add 0.5 to y-coordinate of {drop}
6.         drop 1 iron ingot at {drop}
7.    
8. on mine of gold ore:
9.     if player's tool is a pickaxe with lore "&7Smelting Touch":
10.         clear drops
11.         set {drop} to location of target block of player
12.         add 0.5 to y-coordinate of {drop}
13.         drop 1 gold ingot at {drop}
14.  
15. on enchant:
16.     if event-item is a pickaxe:
17.         chance of 10%:
18.             set lore of event-item to "&7Smelting Touch"
19.             if event-item is not enchanted with unbreaking:
20.                 enchant event-item with unbreaking 1

The skript works if I replace every event-item with tool, but I want it to change the item that was enchanted, not the item the player is holding.