I Can't Get this to work

Code (Skript):

1. #
2. #==========================
3. # Custom Enchants v1.0
4. #
5. # By SoloGamingYT
6. #
7. #
8.  
9.  
10.  
11. on mine:
12.     if player's tool has lore "&7Miner I":
13.         set {_1} to location of event-block
14.         set {_2} to location of event-block
15.         if player's pitch is between -50 and 50:
16.             add 1 to y-coord of {_1}
17.             subtract 1 from y-coord of {_2}
18.             if player's horizontal facing is west or east:
19.                 add 1 to z-coord of {_1}
20.                 subtract 1 from z-coord of {_2}
21.                 loop blocks within {_1} to {_2}:
22.                     skellett break loop-value naturally using player's tool          
23.             else if player's horizontal facing is north or south:
24.                 add 1 to x-coord of {_1}
25.                 subtract 1 from x-coord of {_2}
26.                 loop blocks within {_1} to {_2}:
27.                     skellett break loop-value naturally using player's tool
28.         else:
29.             add 1 to x-coord of {_1}
30.             add 1 to z-coord of {_1}
31.             subtract 1 from x-coord of {_2}
32.             subtract 1 from z-coord of {_2}
33.             loop blocks within {_1} to {_2}:
34.                 skellett break loop-block naturally using player's tool
35.  

The Error(s):
http://imgur.com/a/Brnjz