Raised exception while starting the application. Fix the error and restart.

Message
Failed parsing schedule at info from settings: null
Handler
org.fao.geonet.Geonetwork
Exception
java.lang.IllegalArgumentException: Failed parsing schedule at info from settings: null
Stack
java.lang.IllegalArgumentException: Failed parsing schedule at info from settings: null
	at org.fao.geonet.kernel.setting.SettingInfo.getLuceneIndexOptimizerSchedulerAt(SettingInfo.java:168)
	at org.fao.geonet.kernel.search.LuceneOptimizerManager.<init>(LuceneOptimizerManager.java:69)
	at org.fao.geonet.kernel.search.SearchManager.initNonStaticData(SearchManager.java:511)
	at org.fao.geonet.kernel.search.SearchManager.init(SearchManager.java:488)
	at org.fao.geonet.Geonetwork.start(Geonetwork.java:299)
	at org.fao.geonet.Geonetwork.start(Geonetwork.java:117)
	at jeeves.server.JeevesEngine.initAppHandler(JeevesEngine.java:457)
	at jeeves.server.JeevesEngine.init(JeevesEngine.java:193)
	at jeeves.server.sources.http.JeevesServlet.init(JeevesServlet.java:80)
	at javax.servlet.GenericServlet.init(GenericServlet.java:158)
	at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1143)
	at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1096)
	at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:989)
	at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4957)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5264)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:726)
	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:698)
	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:696)
	at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:1024)
	at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1911)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
	at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:112)
	at org.apache.catalina.startup.HostConfig.deployWARs(HostConfig.java:825)
	at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:475)
	at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1618)
	at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:319)
	at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:123)
	at org.apache.catalina.util.LifecycleBase.setStateInternal(LifecycleBase.java:423)
	at org.apache.catalina.util.LifecycleBase.setState(LifecycleBase.java:366)
	at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:946)
	at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:835)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1396)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1386)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
	at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134)
	at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:919)
	at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:263)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
	at org.apache.catalina.core.StandardService.startInternal(StandardService.java:432)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
	at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:927)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
	at org.apache.catalina.startup.Catalina.start(Catalina.java:772)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:345)
	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:476)