Error when doing cross document linking

Hi all,

I have few documents and I am trying to implement cross document linking between documents (HTML for now).

My environment is Java, Eclipse, Ant and the Apache XSLT and FOP stuff.

I get the following error which is causing my links to come as ?????

        [xslt] Loading stylesheet D:\Projects\docbook-xsl\docbook-xsl-1.78.0\html\docbook.xsl
        [xslt] D:\Projects\docbook-xsl\docbook-xsl-1.78.0\html\xref.xsl:1095:59:Warning! Can not load requested doc: Programmer's Error!  putDocumentInCache found reparse of doc: file:///D:/Projects/6.1.2-18Feb/applications/documentation/src/main/documentation/olinkdb.xml
        [xslt]
 D:\Projects\docbook-xsl\docbook-xsl-1.78.0\html\xref.xsl:1117:22: Warning! Error: unresolved olink: targetdoc/targetptr = 'userguide/chapter.server.installation'.

I have double checked and all the paths are correct. Do you have an idea what might be the problem? 

I have followed the instructions found here - http://www.sagehill.net/docbookxsl/Olinking.html

Thank you,
Doru