Type Error isDevTools Open is not a function

Hi, I'm using the following scripts in this order:
1) HIME_PreEmptiveBattleEvents
2) TerraxLighting
3) YEP_CoreEngine
4) YEP_EventChasePlayer
5) YEP_X_EventChaseStealth

And I get the following error when I try and run the game.

Screenshot of Error Message

I have an event with the following content
page 1

page 1 of event

◆If：Script：$gamePlayer.isStealthMode()
◆Control Variables：#0001 Pre-Emptive = 1
◆Control Variables：#0002 Surprise = 0
◆Battle Processing：Drone
：If Win
◆Change EXP：Entire Party, + {Stealth EXP} (Show Level Up)
◆Erase Event
◆
：If Escape
◆Control Self Switch：A = ON
◆
：End
◆
：Else
◆Control Variables：#0001 Pre-Emptive = 0
◆Control Variables：#0002 Surprise = 1
◆Battle Processing：Drone*3
：If Win
◆Erase Event
◆
：If Escape
◆Control Self Switch：A = ON
◆
：End
◆
：End

page 2

page 2 of event

◆Show Balloon Icon：This Event, Question (Wait)
◆Wait：60 frames
◆Show Balloon Icon：This Event, Silence (Wait)
◆Wait：60 frames
◆Control Self Switch：A = OFF

Incase you can't read the screenshot the error says:
TypeError:
require(,,,).Window.get(...).isDevTools Open is not a function

When I remove YEP_CoreEngine it gives me another error

ReferenceError:
x is not defined

Edit:
I forgot to set a number for x in
this._chaseRange = x

That solved the reference error

Then updating the plugins to the latest version made it work.