java.io.FileNotFoundException: /opt/openfire-3.6.3/monitoring/search/segments (No such file or directory)

Every 15 minutes I am having the following error in my error.log. I assume it is coming of the monitoring service plugin. I am using the mysql database as the backend.

2009.02.26 05:35:55 [org.jivesoftware.openfire.archive.ArchiveIndexer.updateIndex(ArchiveIndexer.ja va:290)]
java.io.FileNotFoundException: /opt/openfire-3.6.3/monitoring/search/segments (No such file or directory)
at java.io.RandomAccessFile.open(Native Method)
at java.io.RandomAccessFile.(Unknown Source)
at org.apache.lucene.store.FSIndexInput$Descriptor.(FSDirectory.java:430)
at org.apache.lucene.store.FSIndexInput.(FSDirectory.java:439)
at org.apache.lucene.store.FSDirectory.openInput(FSDirectory.java:329)
at org.apache.lucene.index.SegmentInfos.read(SegmentInfos.java:45)
at org.apache.lucene.index.IndexWriter$1.doBody(IndexWriter.java:264)
at org.apache.lucene.store.Lock$With.run(Lock.java:99)
at org.apache.lucene.index.IndexWriter.(IndexWriter.java:259)
at org.apache.lucene.index.IndexWriter.(IndexWriter.java:244)
at org.apache.lucene.index.IndexModifier.init(IndexModifier.java:148)
at org.apache.lucene.index.IndexModifier.(IndexModifier.java:111)
at org.jivesoftware.openfire.archive.ArchiveIndexer.updateIndex(ArchiveIndexer.jav a:231)
at org.jivesoftware.openfire.archive.ArchiveIndexer$2.run(ArchiveIndexer.java:156)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)