[Scripting Question] Custom items can't be picked up?

[Plutoniarch]

I'm trying to add items to function like HMs, but for some reason I get an error message whenever I try to give one to the player. It's the same error every time:

---------------------------
Pokemon Redshift
---------------------------
Exception: RuntimeError

Message: Script error within event 14, map 22 (Gedeo Town):

Exception: NoMethodError

Message: Section135:792:in `pbStoreItem'undefined method `length' for nil:NilClass

***Full script:

Kernel.pbItemBall(:DARKLANTERN)

Interpreter:243:in `pbExecuteScript'

PField_Field:2084:in `pbItemBall'

(eval):1:in `pbExecuteScript'

Interpreter:794:in `eval'

Interpreter:243:in `pbExecuteScript'

Interpreter:794:in `command_111'

Interpreter:320:in `execute_command'

Interpreter:193:in `update'

Interpreter:106:in `loop'

Interpreter:198:in `update'



Interpreter:276:in `pbExecuteScript'

Interpreter:794:in `command_111'

Interpreter:320:in `execute_command'

Interpreter:193:in `update'

Interpreter:106:in `loop'

Interpreter:198:in `update'

Scene_Map:103:in `update'

Scene_Map:101:in `loop'

Scene_Map:114:in `update'

Registered Items:102:in `main'



This exception was logged in

C:\Users\Thomas\Saved Games/Pokemon Redshift/errorlog.txt.

Press Ctrl+C to copy this message to the clipboard.
---------------------------
OK
---------------------------

Anyone have a fix for this or can tell me what's happening? Thank you.