Moonpearl script Animated Battlers help!! x((

[Starmage]

Hello all, I really need help regarding Moonpearl's animated battlers script which is what I'm using in the game I'm working on, it's just that:

when characters in my party are dead, and I fight alone (with 1 surviving party member) an error pops up when I try to target attack an enemy in battles:

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I really am not very good at this, but what is causing the problem? thankyou so much for those who can answer! :)

And here's the link to moonpearl's scripts!
http://moonpearl-gm.blogspot.fr/2012/11/...tlers.html