: Now I've got a completely different error: : "org.apache.lucene.index.CorruptIndexException: Unknown format version: -9". : I think it might be time for a fresh install...
I've added a FAQ for this... http://wiki.apache.org/solr/FAQ#What_does_.22CorruptIndexException:_Unknown_format_version.22_mean_.3F What does "CorruptIndexException: Unknown format version" mean ? This happens when the Lucene code in Solr used to read the index files from disk encounters index files in a format it doesn't recognize. The most common cause is from using a version of Solr+Lucene that is older then the version used to create that index. -Hoss
