I have integrated JForum into my application. But I am getting this error. Please somebody help me with this. I have used lucene in my search module. I think it's the cause for this. I am not sure about it.
This sort of problem usually comes from having one version of a library in your development environment, and a different version in deployment. The exception specifically means that the class net.jforum.search.LuceneSettings was compiled against a version of Lucene that had a method FSDirectory FSDirectory.getDirectory(String), and the runtime version does not.