[Discussion] How do i fix? Battle in Essentials v18.1

[Thu Apr 01 00:25:57 -0300 2021]
[Pokémon Essentials version 18.1]
Exception: NameError
Message: undefined local variable or method `b' for #<PokeBattle_Battle:0x7b715df470>

Backtrace:
145:Battle_Action_Switching:248:in `pbMessageOnRecall'
150:Battle_Phase_Attack:57:in `pbAttackPhaseSwitch'
150:Battle_Phase_Attack:51:in `each'
150:Battle_Phase_Attack:51:in `pbAttackPhaseSwitch'
150:Battle_Phase_Attack:183:in `pbAttackPhase'
142:Battle_StartAndEnd:323:in `pbBattleLoop'
059:PBDebug:6:in `logonerr'
142:Battle_StartAndEnd:323:in `pbBattleLoop'
142:Battle_StartAndEnd:308:in `loop'
142:Battle_StartAndEnd:308:in `pbBattleLoop'

Like the error states, you have a variable, "b" somewhere in the code related to switching that hasn't been defined.

You should probably check pbMessageOnRecall for this undefined variable.