Error while deploying jforum

I have copied the jforum folder into the FTP directory mentioned by my service provider. Its a lInux hosting with tomcat support. When I try to access my site i.e http://stuffuneed.co.in/jforum/
I get the following error

javax.servlet.ServletException: Servlet.init() for servlet jforum threw exception
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:568)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:190)

root cause
net.jforum.exceptions.ForumStartupException: Error while starting JForum
org.apache.lucene.index.SegmentInfo.<init>(SegmentInfo.java:128)
org.apache.lucene.index.SegmentInfos.read(SegmentInfos.java:213)
org.apache.lucene.index.IndexReader$1.doBody(IndexReader.java:190)
org.apache.lucene.index.SegmentInfos$FindSegmentsFile.run(SegmentInfos.java:610)
org.apache.lucene.index.IndexReader.open(IndexReader.java:185)
root cause
net.jforum.exceptions.ForumException: java.lang.NegativeArraySizeException
org.apache.lucene.index.SegmentInfo.<init>(SegmentInfo.java:128)
org.apache.lucene.index.SegmentInfos.read(SegmentInfos.java:213)
org.apache.lucene.index.IndexReader$1.doBody(IndexReader.java:190)
org.apache.lucene.index.SegmentInfos$FindSegmentsFile.run(SegmentInfos.java:610)
org.apache.lucene.index.IndexReader.open(IndexReader.java:185)
org.apache.lucene.index.IndexReader.open(IndexReader.java:167)

Please let me know if you have any idea about this problem...Thanks in advance

[originally posted on jforum.net by tiger]

It's hard to say without knowing full details of the environment. A quick guess would be that the FTP process left the directory and files owned by your and not by the web app server user. This means the code can't write to (and maybe read from) from the jforum directory/files.
[originally posted on jforum.net by monroe]