A question about simple transformation

Hello Experts,
I wrote a simple transformation according to certain XML structure. But when I ran the transformation with an XML file, an exception will pop up as following
"Attribute 'requestListId' expected"
So I executed my program once again in debug mode and go inot the transformation. The exception comes from the following line
<tt:attribute name="requestListId" value-ref="REQUEST_LIST_ID"/>
I can open the XML file with IE. I checked the XML carefully and can't find anything wrong.
I really don't why the exception poped up.
Can any expert provide support and help in Transformation programming and Transfromation debug?
Thanks a lot.
Best Regards, Johnney.

Have other solution. So close it.

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