"You've used the ListIndex property incorrectly" message

From: mscertified <rupert@xxxxxxxxxxxxx>
Date: Wed, 7 May 2008 11:58:01 -0700

"You've used the ListIndex property incorrectly" message

Any idea what causes this message to come from code:

Me!lstReplace.ListIndex = i

i is a long
the value of i is within the listcount
I only get this error sometimes, not every time.
.

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