From: Charles Caldwell <lists@...>
Date: 2013-01-29T01:01:18+09:00
Subject: Re: Can we attach documents to excel columns using Ruby?

It appears that you are passing in '.' and '..' into your Dir.entries 
block. That would cause the error you are getting.

Try skipping those two entries at the beginning of your block or use 
Dir#glob which does not capture '.' and '..'

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