**Solved. Remove file search in /openfire/monitoring/ **
** error openfire 4.0.3 monitoring service**
org.jivesoftware.openfire.container.PluginManager - Error loading plugin: /opt/openfire/plugins/monitoring
org.picocontainer.PicoLifecycleException: PicoLifecycleException: method ‘public abstract void org.picocontainer.Startable.start()’, instance 'org.jivesoftware.openfire.archive.ArchiveIndexer@e9a8bb, null