[RMXP] MOONPEARLS ANIMATED BATTLER SCRIPT HELP!

Hello all, I am really quite a newbie when it comes to RMXP and the scripts, and I'm currently using Moonpearl's scripts for a game I'm working on with RMXP! but I'm having a problem with the animated battlers script, and you can find her script here:
http://moonpearl-gm.blogspot.fr/2012/11/monnpearls-animated-battlers.html


My problem is:
whenever I try to enter a new battle with only 1 surviving party member (other members are dead), this error comes up:


though it works fine when everyone dies in a current battle with 1 survivor, but after that, when entering a different battle with 1 survivor, the error comes out! x((

I really need help regarding this, and I really appreciate any responses regarding this!! thanks so much! XDD