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Can not enable http-binding

I am using openfire 4.2.1 ,I am new to open fire , HTTP-bind was working then suddenly it becomes disabled and while trying to make it enable agian it throw error and below are the log

java.lang.IllegalStateException: STARTED
at org.eclipse.jetty.server.handler.HandlerWrapper.setServer(HandlerWrapper.java:110)
at org.eclipse.jetty.server.handler.ContextHandler.setServer(ContextHandler.java:280)
at org.eclipse.jetty.webapp.WebAppContext.setServer(WebAppContext.java:1307)
at org.eclipse.jetty.server.handler.HandlerCollection.setServer(HandlerCollection.java:146)
at org.eclipse.jetty.server.handler.HandlerCollection.setServer(HandlerCollection.java:146)
at org.eclipse.jetty.server.handler.HandlerWrapper.setHandler(HandlerWrapper.java:84)
at org.jivesoftware.openfire.http.HttpBindManager.start(HttpBindManager.java:220)
at org.jivesoftware.openfire.http.HttpBindManager.restartServer(HttpBindManager.java:814)
at org.jivesoftware.openfire.http.HttpBindManager.propertyDeleted(HttpBindManager.java:856)
at org.jivesoftware.util.PropertyEventDispatcher.dispatchEvent(PropertyEventDispatcher.java:91)
at org.jivesoftware.util.JiveProperties.remove(JiveProperties.java:235)
at org.jivesoftware.util.JiveGlobals.deleteProperty(JiveGlobals.java:897)
at org.jivesoftware.openfire.http.HttpBindManager.setHttpBindPorts(HttpBindManager.java:565)
at org.jivesoftware.openfire.admin.http_002dbind_jsp.handleUpdate(http_002dbind_jsp.java:43)
at org.jivesoftware.openfire.admin.http_002dbind_jsp._jspService(http_002dbind_jsp.java:178)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:812)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1669)
at com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java:118)
at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:52)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
at org.jivesoftware.util.LocaleFilter.doFilter(LocaleFilter.java:73)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
at org.jivesoftware.util.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:49)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
at org.jivesoftware.admin.PluginFilter.doFilter(PluginFilter.java:226)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
at org.jivesoftware.admin.AuthCheckFilter.doFilter(AuthCheckFilter.java:215)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:577)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:215)
at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:110)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
at org.eclipse.jetty.server.Server.handle(Server.java:499)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)
at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:544)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
at java.lang.Thread.run(Thread.java:745)