Prolog instantiation error?

Posted by KP65 on Stack Overflow See other posts from Stack Overflow or by KP65
Published on 2010-04-09T13:13:03Z Indexed on 2010/04/09 13:23 UTC
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prolog

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swi-prolog

Hello guys, I'm stuck with some sort of error which i don't really understand in prolog. I get this error when calling a rule(which seems to work sometimes?) :

error(instantiation_error,Var0)

Can anyone explain to me what this means?

Thanks

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