Relic Castle

So I just recently downloaded RPGMaker and Pokemon Essentials, and started making a game. I'm not familiar with much of the scripts at all. I managed to make the surge abilities that the tapus have, and I've done a little work in custom tilesets. I just installed the Defining Trainer's EVs script, and I did some other tiling work, then got this error:

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Exception: NameError
Message: uninitialized constant PokemonLoadScene::TrainerWalkingCharSprite
PScreen_Load:164:in `pbSetParty'
PScreen_Load:323:in `pbStartLoadScreen'
Main:6:in `main'
Main:49:in `mainFunctionDebug'
Main:27:in `mainFunction'
Main:27:in `pbCriticalCode'
Main:27:in `mainFunction'
Main:59
Main:58:in `loop'
Main:67
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Help?