[Question] Emerald-style Exit Arrows wont work

[Pokébook1]

Hello. I downloaded the graphics of the arrows in the pictures folder, then I painted the arrows in another color and made them transparent with RPG Maker XP with materials - import - transparent and I chose white and now its transparent.

Then I paste the script that I'd copy from the Essentials Wiki and paste them above main, called it ExitArrow
and made an exit-event called ExitArrow

Then I playtest and this error pops out:

Spoiler:

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Pokemon Essentials
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Exception: NameError

Message: uninitialized constant DIR_DOWN

ExitArrow:32:in `pxCheckExitArrows'

ExitArrow:29:in `each'

ExitArrow:29:in `pxCheckExitArrows'

ExitArrow:55

ExitArrow:54:in `call'

Event:54:in `trigger'

Event:49:in `each'

Event:49:in `trigger'

PField_MapFactory:207:in `setSceneStarted'

Scene_Map:31:in `createSpritesets'



This exception was logged in

C:\Users\User\Saved Games/Pokemon Essentials/errorlog.txt.

Press Ctrl+C to copy this message to the clipboard.
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OK
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[tustin2121]

My apologies. I seem to have included a couple of constants from my own project when I posted that tutorial. I've edited the page to remove those constants and put in simple numbers which mean the same thing. Go recopy the script into your project and test it again. Again, sorry about that. ^_^;