Export to Excel in Panelcollection not working

Hi,
I am using JDeveloper 11.1.1.4.0. on WinXP
I am surrounding PanelCollection to existing table in my application.
After clicking on export to excel option first time it shows file name as my .jspx file and type as HTML, here it throws exception NPE(i.e. exporting fails).
when i click on the export option in the same page second time it shows the file name as my excel file name and type as Microsoft Excel hence downloads without errors.
I have used the below code snippet inside panelCollection component:
<f:facet name="toolbar">
<af:toolbar id="t1">
<af:commandImageLink text="Export to Excel"
inlineStyle="width:95px;" id="cil4">
<af:exportCollectionActionListener exportedId="tVolDed"
type="excelHTML"
filename="c:\\try.xls"/>
</af:commandImageLink>
</af:toolbar>
Could anybody help me out for the same?
Thanks in advance!

At my end, the code is working fine.My code is :
<f:facet name="toolbar">
<af:toolbar id="t1">
<af:commandImageLink text="Export to Excel" inlineStyle="width:95px;"
id="cil4">
<af:exportCollectionActionListener exportedId="t2"
type="excelHTML"
filename="empDtlsExport.xls"/>
</af:commandImageLink>
</af:toolbar>
Could you please try with filename as "try.xls" only.
Please let us know if you are facing this issue.

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