NoMethodError: undefined method metaID= for nil:NilClass

do u know what this means
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Pokemon Chosen Ones
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[Pok?mon Essentials version 17.2]

Exception: NoMethodError

Message: undefined method metaID=' for nil:NilClass

PScreen_Save:2:inpbSave'

AutoSave:91:in update'

Scene_Map:234:inmain'

Scene_Map:231:in loop'

Scene_Map:236:inmain'

Main:49:in mainFunctionDebug'

Main:27:inmainFunction'

Main:27:in pbCriticalCode'

Main:27:inmainFunction'

Main:59



This exception was logged in

C:\Users\Mike\Saved Games\Pokemon Chosen Ones\errorlog.txt.

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OKcan i get help with this