[Q]uestion - about error messages

hi - my name is markus

i'm scripting some stuff and got this error message

>> MAXScript Rollout Handler Exception: -- Runtime error: array index out of bounds: 1721 <<

while i was resorting a array (with my own method).
Could you please tell me how to change the bounds of array index ?
Or maybe how to fix this error :)

thx

markus