[Error] Trainer Card BW2 Error

[Okabe_tv]

Hi I'm trying to insert the BW2 trainer card script in my fan game but it gives me this error:

[Pokémon Essentials version 19.1]
[Generation 8 Project v1.1.2]
[EBDX v1.2.6]

Exception: ArgumentError
Message: undefined class/module SignedWordArray

Backtrace:
377:CardTrainer:208:in `load'
377:CardTrainer:208:in `load'
377:CardTrainer:208:in `load_data'
377:CardTrainer:208:in `initialize'
377:CardTrainer:782:in `new'
377:CardTrainer:782:in `pbStartScene'
377:CardTrainer:1036:in `pbStartScreen'
[Modular Menu] Config.rb:123:in `block (2 levels) in <main>'
080:MessageConfig:562:in `pbFadeOutIn'
[Modular Menu] Config.rb:122:in `block in <main>'