I used to make boot animations back in the day, but it has been a bit, so might be a bit rusty. However, I am pretty sure your issue is that you have the Part 0 folder nestled in another folder called Part 0. Remove one of them and try again.
Where are you seeing the index out of range comment? Only info I could find on that was from a program called Boot Animation Factory and the dev suggested it was an issue with AMD processors for some reason. Not sure if it is applicable for you, just throwing it out there.
Just tried it with boot box and it works fine but it shows blank when booting.
Just tried it with boot box and it works fine but it shows blank when booting.