Error With Custom Pokedex

[BaguetteCat]

So I've been trying to make a pokedex for my region, but each time I enter this menu it gives me this error:
[Pokémon Essentials version 21.1]
[v21.1 Hotfixes 1.0.9]

Exception: NoMethodError
Message: undefined method `[]' for nil:NilClass

Backtrace:
UI_Pokedex_Main:28:in `species'
UI_Pokedex_Main:422:in `pbRefresh'
UI_Pokedex_Main:414:in `pbRefreshDexList'
UI_Pokedex_Main:295:in `pbStartScene'
UI_Pokedex_Main:1298:in `pbStartScreen'
UI_PauseMenu:151:in `block (2 levels) in <main>'
MessageConfig:575:in `pbFadeOutIn'
UI_PauseMenu:148:in `block in <main>'
UI_PauseMenu:124:in `block in pbStartPokemonMenu'
UI_PauseMenu:117:in `loop'
I've tried to mess with the dex order and things like that. The only plugins I have are

• Following Pokemon EX
• Generation 9 Pack Scripts
• v21.1 Hotfixes

Is one of those the reason for the error?