Why is "if (fn_vec.length == 0)" throwing error "RangeError: Error #1125: The index 0 is out of rang

Why is the statement "if (fn_vec.length == 0)" throwing error "RangeError: Error #1125: The index 0 is out of range 0."?
fn_vec is a Vector.<Function>, and it's not null.  It's length is in fact zero.
This makes no sense.

Hi yu.wei.qian.07,
the problem with the second block of code is that you are
enumerating through the children of the canvas using their index
number. The problem with this is that you are removing children
from the canvas. When you remove a child from a parent object the
index is recalculated and ultimately the number of children for
that parent object is reduced by 1. Since you are starting at zero
and going forward through the loop index you are reaching the last
child index about half way through the loop. A way that would
probably work to fix this would be to loop backwards through the
children (ie start at the last index and loop back to index 0).
I hope this helps.

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