This is the error that i keep having everytime i get to the sabertooths in BRA arena.
I was unable to reproduce that error with other types of Sabertooths and I'm still a long ways away from getting that far in BRA so I can't test it there.
I was looking at the code near that error and I saw something that possibly shouldn't be there.
You can try deleting this line from the script:
$coord2 = PixelSearch($topLeft[0]+333, $topLeft[1]+200, $topLeft[0]+338, $topLeft[1]+343, $AttackColor1, 6)
It's probably line 618 in the version you are running.
It looks like I'm checking for something twice when there is no need for it - and the 2nd check is different from the first which means it could pass the first check, then fail the second (and then bomb with that error).
So delete that line and see what happens.
If you can't find it, let me know and I'll upload a new version.
(Still trying to get a Clair up to level 91)