"Value 0 not defined by a constant in PBSpecies" error in Pok?dex

"Value 0 not defined by a constant in PBSpecies" error in Pokédex

I am making a pokemon game but if I use the pokedex and go over a ???? this happens:


Exception: RuntimeError
Message: Value 0 not defined by a constant in PBSpecies
Compiler:1502:in `getConstantName'
PokemonUtilities:1049:in `pbPokemonBitmapFile'
PokemonPokedex:1054:in `pbPokedex'
PokemonPokedex:1045:in `loop'
PokemonPokedex:1083:in `pbPokedex'
PokemonPokedex:1044:in `pbActivateWindow'
PokemonPokedex:1044:in `pbPokedex'
PokemonPokedex:1109:in `pbStartScreen'
PokemonPauseMenu:159:in `pbStartPokemonMenu'
PokemonPauseMenu:156:in `pbFadeOutIn'

what do I need to do to fix this problem?
do I need to change something in the PBS?

What version of Essentials are you using? I think this is fixed in 15.1.