Relic Castle

Hello, so when I playtest my game and I walk with my eevee to the next route and through the grass, where other pokémon appear randomly in the overworld - then suddenly an error appears:

---------------------------
Error
---------------------------
Script 'Interpreter' line 276: RuntimeError occurred.

Script error within event 4 (coords 21,21), map 32 (Alabastia):

Exception: NoMethodError

Message: PField_Encounters:345:in `pbGenerateWildPokemon'undefined method `pbHasItem?' for #<PokemonBag:0x9350550>

***Full script:

Kernel.pbNoticePlayer(get_character(0))
pbWildBattle(:ODDISH,2)
pbSetEventTime


Interpreter:243:in `pbExecuteScript'

PField_Battles:88:in `pbWildBattle'

(eval):2:in `pbExecuteScript'

Interpreter:1606:in `eval'

Interpreter:243:in `pbExecuteScript'

Interpreter:1606:in `command_355'

Interpreter:494:in `execute_command'

Interpreter:193:in `update'

Interpreter:106:in `loop'

Interpreter:198:in `update'


---------------------------
OK
---------------------------


When I click "OK" the game crashes. I don't know where the problem is, I think maybe it has something to do with the line 136 in PItem_Items:
Code: 
if ret && $ItemData[item][ITEMUSE]==1 # Usable on Pokémon, consumed
              bag.pbDeleteItem(item)
            end

Thanks in advance for any help!
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