Problem in downloading graph as image

Hi All,
I'm trying to download pie graph as image when click on command link, At first time working fine when im suppose to click command link again graph is not getting downloaded.... here comes code...
<af:commandLink text="Save As Image" id="image">
<af:fileDownloadActionListener method="#{debtors.savePieAsPNG}" contentType="image/png" filename="agedDebtorsPieChart.png"/>
</af:commandLink>
public void savePieAsPNG(FacesContext facesContext,
OutputStream outputStream) {
try {
debtorsPie.getImageView().exportToPNG(outputStream); /* 'debtorsPie' binding used in jspx page*/
outputStream.flush();
catch (Exception e){
e.printStackTrace();
Image is not downloading more than once
Please help on this...

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PS1=rommon ! >
FE_PORT=0
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RET_2_RTS=20:35:55 UTC Thu Sep 25 2014
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What I notice in the original post is this error
ARP: address resolution for 10.0.0.2 timed out.
which says that the router is looking for the 10.0.0.2 server but not getting response to its arp request. Can the original poster clarify for us how the device that has the image file is connected to the router that has the problem? Also what kind of device is 10.0.0.2? Is it a PC running TFTP server software or is it something else?
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