“ Entity reference problem

I am using a a XSL to generate PDF from source XML
using FOP. When I run the transformation I get an
error saying entity “ was referenced but not
declared. This is for the left double quotes. So is it
a some kind of problem with the encoding used? In my
stylesheet I have the following

<?xml version="1.0" encoding="ISO-8859-1"?>

<xsl:output method="xml" indent="no"
encoding="ISO-8859-1"/>
Do I need to make any changes in my XSL to resolve
this?
Any help is appreciated.
Thanks,
Abhi



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