Restart Solr. You likely manually removed parts of the index that i cannot recreate. A restart usually fixes this.
> no segments* file found in > org.apache.lucene.store.NIOFSDirectory@/opt/apache-solr-3.4.0/example/solr > /data/index lockFactory=org.apache.lucene.store.NativeFSLockFactory@9b1670: > files: [write.lock] org.apache.lucene.index.IndexNotFoundException: no > segments* file found in > org.apache.lucene.store.NIOFSDirectory@/opt/apache-solr-3.4.0/example/solr > /data/index
