[Error] Why is my "Pocket Sand" script causing crashes at startup, and why is the error reporter stuck in a loop of "Swap } and ). And again. And again."?

[SuperSpyroDragon64]

Why is my "Pocket Sand" script causing crashes at startup, and why is the error reporter stuck in a loop of "Swap } and ). And again. And again."?

Every error message I get tells me the engine doesn't like the placement of } or ), but switching them around and adding extra )s and }s does nothing to make the engine happy with my code. I just get an unhelpful error message that tells me nothing about what's actually wrong with code that seems fine.

Battle::ItemEffects::OnSwitchIn.add(:POCKETSAND,
  proc { |item, battler, battle|
    battle.pbDisplay(_INTL("{1} threw Pocket Sand!",
    battle.pbStartWeatherAbility(:Sandstorm, battler)
  }
)

When a Pokemon is switched in while holding this item, it should cause a Sandstorm.

My "Caltrops" held item works just fine. Switch in a Pokemon holding Caltrops, and he scatters a layer of Spikes onto the foe's side of the field.

You can have this working code and do whatever you want with it.

Battle::ItemEffects::OnSwitchIn.add(:CALTROPS,
  proc { |item, battler, battle|
  next    if user.pbOpposingSide.effects[PBEffects::Spikes] >= 3
      user.pbOpposingSide.effects[PBEffects::Spikes] += 1
    battle.pbDisplay(_INTL("{1} scatters Caltrops on the foe's side of the field!",
       battler.pbThis, battler.itemName))
  }
)

 

[Vendily]

battle.pbDisplay(_INTL("{1} threw Pocket Sand!",
you didn't finish this line
battle.pbDisplay(_INTL("{1} threw Pocket Sand!",battler.pbThis))

 

[SuperSpyroDragon64]

Thank you, that code looks right. But I still get this error message every time I get into a battle, no matter what NPC I am battling.

[Pokémon Essentials version 20.1]
[v20.1 Hotfixes 1.0.2]

Script error in event 5 (coords 27,4), map 3 (Aaa's house)
Exception: NameError
Message: wrong constant name Battle::Move::

***Full script:
TrainerBattle.start(:LEADER_Brock, "Brock")
Backtrace:
172:Battle_Move:58:in `const_defined?'
172:Battle_Move:58:in `from_pokemon_move'
161:Battler_Initialize:89:in `block in pbInitPokemon'
161:Battler_Initialize:88:in `each'
161:Battler_Initialize:88:in `each_with_index'
161:Battler_Initialize:88:in `pbInitPokemon'
267:ShadowPokemon_Other:196:in `pbInitPokemon'
161:Battler_Initialize:61:in `pbInitialize'
148:Battle_StartAndEnd:117:in `pbCreateBattler'
148:Battle_StartAndEnd:153:in `block (3 levels) in pbSetUpSides'

What am I doing wrong?