IndexError: list index out of range

[kay1ess]

Hi folk, when i want to split a big obj to smaller objs, has an error~ how can i solve it? plz

"""
Traceback (most recent call last):
File "PythonObjSplitter_v1.py", line 88, in
verts.extend(getVertsOrUvsForGivenTriangle(triangleCounter, verticesList))
File "PythonObjSplitter_v1.py", line 11, in getVertsOrUvsForGivenTriangle
data.append(vertsOrUvsArray[vuvIndex])
IndexError: list index out of range
"""