[SKRIPT Crashes server, I don't know why]

I don't know why, but whenever I load this skript into my world, the server crashes. My skript is supposed to be a 'Level 2 TNT cannon' that you can craft using the level 1 cannon (which works just fine), but it just crashes the server. Here is my skript: (sorry if it's very inefficient, I'm new to skripting)

command /resetrecipetntstick2:
    permission: op
    trigger:
        wipe server crafting recipes
        send "&aAll recipes cleared"

on load: 
    register new shaped recipe for a tnt of unbreaking named "&cCompressed TNT" using tnt, tnt, tnt, tnt, tnt, tnt, tnt, tnt, tnt
    register new shaped recipe for a stick named "&4Level 2 TNT Cannon" using tnt of unbreaking named "&cCompressed TNT", tnt of unbreaking named "&cCompressed TNT", tnt of unbreaking named "&cCompressed TNT", tnt of unbreaking named "&cCompressed TNT", stick named "&4TNT Cannon", tnt of unbreaking named "&cCompressed TNT", tnt of unbreaking named "&cCompressed TNT", tnt of unbreaking named "&cCompressed TNT", tnt of unbreaking named "&cCompressed TNT"

on craft:
    player's inventory contains stick named "&4Level 2 TNT Cannon"
    broadcast "%player% has made a level 2 TNT cannon!"

on arm swing:
    player has a stick named "&4&lLevel 2 TNT Cannon" in main hand
    shoot tnt from player at speed 1
    wait 20 ticks
    strike lightning at the last spawned tnt
    spawn 7 tnt at the last spawned tnt