Following Pokemon Script Error

[Insane KoTJ]

Hey guys, I try to put this following pokemon script on my game, but when I try to to emulate the game it give me this error message:

Spoiler: Images

I don't even try to call the script, the error appear in the compilation...
really don't know how to fix, any tips?

 

[Luka S.J.]

The script is not compatible with Essentials v17.x
A lot of classes and functions have been renamed from v16.x to v17.x, so several older scripts aren't going to work with it. I don't know the full extent of the name changes in Essentials v17.x, but the

class PokemonScreen

the script is having an issue with has been renamed to

class PokemonPartyScreen

 

[Insane KoTJ]

Looks like just rename the classes doesn't work

Spoiler: Error Msg

---------------------------
Pokemon Essentials
---------------------------
[Pokémon Essentials version 17]
Exception: NoMethodError
Message: undefined method `each' for nil:NilClass
Following Pokemon:1785:in `update'
Following Pokemon:1779:in `each'
Following Pokemon:1779:in `update'
Scene_Map:41:in `updateSpritesets'
Scene_Map:35:in `each'
Scene_Map:35:in `updateSpritesets'
Scene_Map:169:in `follow_update'
Following Pokemon:1551:in `update'
Scene_Map:232:in `main'
Scene_Map:229:in `loop'

This exception was logged in
C:\Users\Gabriel\Saved Games\Pokemon Essentials\errorlog.txt.
Press Ctrl+C to copy this message to the clipboard.
---------------------------
OK
---------------------------

But thanks for the help