Help in Pokemon Summary page

Hey guys, I'm having trouble with this code. I want to see the pokemon summary page but it doesn't show up. I'm using EliteBattle btw.

---------------------------
Pokemon Essentials Esp v16.1
---------------------------
Excepción: NameError
Mensaje: undefined local variable or method `ret' for #<PokemonSummary:0xa964a48>
PScreen_Summary:997:in `pbStartScreen'
PScreen_Party:788:in `pbSummary'
PScreen_Party:1898:in `pbPokemonScreen'
PScreen_Party:1810:in `loop'
PScreen_Party:1986:in `pbPokemonScreen'
Menu:494:in `pokemonParty'
Menu:493:in `pbFadeOutIn'
Menu:493:in `pokemonParty'
Menu:465:in `pbMenuInput'
Menu:162:in `pbMenuLoop'

Esta excepción ha sido registrada en
C:\Users\SierraM\Saved Games/Pokemon Essentials Esp v16_1/errorlog.txt.
Presiona Ctrl+C para copiar este mensaje al portapapeles.
---------------------------
Aceptar
---------------------------

How can I fix this error? I cannot see the summary page of my pokemons