[away3d] [Broomstick] removeSegment problem

[do rinal]

Hello,
i use Segment for a animation. In the loop i add new segment using
addSegment of the SegmentSet. i need to remove Segment like this :
segmentSet.removeSegment(segmentSet.segments[0]);

 i have this error :  RangeError: Error # 1125: The index 88 is out of
bounds 18.

this is from the line 141 in the SegmentSet Class : var indVert : uint
= _indices[index] * 11;

could someone explain to me, or have examples.
Thx