XPath Error

Hi,

I am getting the following error when I run

#xsltproc test.xml


XPath error : Invalid type
runtime error: file http://my.com/myinfo.xsl line 221
element variable
Evaluating global variable   being computed ... 
failed

Please let me know what I have to do. 

The line 221 in myinfo.xsl is

<xsl:variable name="staff_table"
select="$myInfo/myinfo/myname/@play" />





                
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