data/index/segments_u (No such file or directory)

[alxsss]

Hello,

I have copied solr's data folder from dev linux box to prod one. When starting 
solr I get this error in prod server. In dev solr starts sucessfully. 

Caused by: java.io.FileNotFoundException: 
/home/apache-solr-3.5.0/example/solr/data/index/segments_u (No such file or 
directory)
        at java.io.RandomAccessFile.open(Native Method)
        at java.io.RandomAccessFile.<init>(RandomAccessFile.java:233)
        at 
org.apache.lucene.store.SimpleFSDirectory$SimpleFSIndexInput$Descriptor.<init>(SimpleFSDirectory.java:70)
        at 
org.apache.lucene.store.SimpleFSDirectory$SimpleFSIndexInput.<init>(SimpleFSDirectory.java:97)
        at 
org.apache.lucene.store.NIOFSDirectory$NIOFSIndexInput.<init>(NIOFSDirectory.java:92)
        at 
org.apache.lucene.store.NIOFSDirectory.openInput(NIOFSDirectory.java:79)
        at org.apache.lucene.store.FSDirectory.openInput(FSDirectory.java:345)
        at org.apache.lucene.index.SegmentInfos.read(SegmentInfos.java:265)
        at 
org.apache.lucene.index.DirectoryReader$1.doBody(DirectoryReader.java:79)
        at 
org.apache.lucene.index.SegmentInfos$FindSegmentsFile.run(SegmentInfos.java:754)
        at org.apache.lucene.index.DirectoryReader.open(DirectoryReader.java:75)
        at org.apache.lucene.index.IndexReader.open(IndexReader.java:462)
        at org.apache.lucene.index.IndexReader.open(IndexReader.java:405)
        at 
org.apache.solr.core.StandardIndexReaderFactory.newReader(StandardIndexReaderFactory.java:38)
        at org.apache.solr.core.SolrCore.getSearcher(SolrCore.java:1092)

There is no segments_u file or folder in the dev box.

Thanks in advenace.
Alex.