error after deleting 400 pokes + rearranging the dex

After deleting say 400 Pokemon in the nat'l dex, rearranging *all* of the battle sprites and *all* of the icons, and deleting them from all of the PBS files I get this game crashing error message that I don't understand:

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Pokemon Fusion Beta 0.2
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Exception: RuntimeError

Message: filename is nil

SpriteWindow:219:in `initialize'

Pokemon_Sprites:117:in `new'

Pokemon_Sprites:117:in `pokemon='

Pokemon_Sprites:102:in `initialize'

PScreen_Load:172:in `new'

PScreen_Load:172:in `pbSetParty'

PScreen_Load:171:in `each'

PScreen_Load:171:in `pbSetParty'

PScreen_Load:324:in `pbStartLoadScreen'

Main:6:in `main'
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EDIT: I am using essentials v 16.2

If I read the error correctly, you are trying to play a game, where a save file exists, and it's trying to load the icon of the party pokemon.
Try deleting your Game.rxdata, since old data doesn't play nice with new code. (Should be in Documents/Saved Games/Pokemon Fusion Beta 0.2).

Gonna teach you how to fish debug (Or at least how I did this).

Wow! Thanks that fixed it! I kinda sucks that the people who downloaded the last version will have to start anew!

EDIT: figured everything out...had to update EBS. The glitch went away. yay!