[Mediawiki-l] Lucene Indexer Error

[Emufarmers Sangly]

I've set up Lucene following the instructions on
http://meta.wikimedia.org/wiki/Installing_lucene_search  When I get to the
indexing stage, I get this error:
Unhandled Exception: java.io.IOException: no root element: U+58
at org.mediawiki.importer.XmlDumpReader.readDump () [0x00000]
at MediaWiki.Search.SearchTool.SearchTool.ImportDump (System.Stringdumpfile,
System.String database) [0x00000]
at MediaWiki.Search.SearchTool.SearchTool.Main (System.String[] args)
[0x00000]
My friend has also set up Lucene on his machine, and he gets the same
error.  We're both at a loss about what the problem is.