I'd followed up all the instructions at this tutorial web site, the topic Filter Unique Records http://www.contextures.com/xladvfilter01.html but I can't filter the unique records. When I pressed enter, a pop-up window says "Reference is not valid". Does any know how to fix it? Please advise.
The link below is my snapshot.
http://i3.photobucket.com/albums/y61...ilterIssue.jpg
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