Yanfly Bug (not sure which version)[Solved on its own]

[Arrogant McElfpants]

Edit: I had somehow left StateId in the add.state() function while defining it. It's such a simple mistake that I can't believe I made it.

While attempting to make a Dualcast/Triplecast replacement for my game using Action Begin/End effects, Buff/State Core's Lunatic Mode and Instant Casts, I noticed a bizarre bug. When I attempted the Dualcast, I received this strange error:

Spoiler: Error received

TypeError: require(...).Window.get(...).isDevToolsOpen is not a function at Object.Yanfly.Util.displayError (YEP_CommonEventMenu.js:1290) at Game_Actor.Game_Battler.customEffectEval (YEP_BuffsStatesCore.js:1376) at Game_Actor.Game_Battler.removeStateEffects (YEP_BuffsStatesCore.js:1407) at Game_Actor.Game_Battler.removeState (YEP_BuffsStatesCore.js:1401) at Game_Actor.Game_Battler.removeState (YEP_X_VisualStateFX.js:308) at Game_Actor.Game_Battler.removeState (YEP_AutoPassiveStates.js:551) at Game_Actor.removeState (YEP_EquipBattleSkills.js:756) at eval (eval at Game_Action.processLunaticBeginEndActionEval (YEP_Z_ActionBeginEnd.js:500), <anonymous>:83:10) at Game_Action.processLunaticBeginEndActionEval (YEP_Z_ActionBeginEnd.js:500) at Game_Action.processLunaticBeginEndActions (YEP_Z_ActionBeginEnd.js:468) Yanfly.Util.displayError @ YEP_CommonEventMenu.js:1288 rpg_managers.js:1949 TypeError: require(...).Window.get(...).isDevToolsOpen is not a function at Object.Yanfly.Util.displayError (YEP_CommonEventMenu.js:1290) at Game_Action.processLunaticBeginEndActionEval (YEP_Z_ActionBeginEnd.js:502) at Game_Action.processLunaticBeginEndActions (YEP_Z_ActionBeginEnd.js:468) at Game_Actor.Game_Battler.processLunaticBeginEndAction (YEP_Z_ActionBeginEnd.js:413) at Game_Actor.Game_Battler.performActionEnd (YEP_Z_ActionBeginEnd.js:401) at Game_Actor.Game_Battler.performActionEnd (YEP_DamageCore.js:1223) at Game_Actor.performActionEnd (rpg_objects.js:4024) at Window_BattleLog.performActionEnd (rpg_windows.js:4913) at Function.BattleManager.actionPerformFinish (YEP_BattleEngineCore.js:2833) at Function.BattleManager.actionPerformFinish (YEP_X_ActSeqPack3.js:482)</anonymous>

This is the notetags for the states (for the Tricast, which would transform into Dualcast and then a cancel state):

Spoiler: State Notetag

<Custom Remove Effect>

target.addState(state12);

</Custom Remove Effect>

<Instant Skill: 8 to 10>

And these are for the Skills to remove the effects:

Spoiler: Skill Notetag

<End Action: Remove State 11>

<End Action: Remove State 12>

<End Action: Remove State 13>