I have just implemented the module in one of our project but are unable to generate and send appointments. Can someone HELP! The Server Console is showing and error: Error in scheduled event 'SEAppointmentNotificationProcesQueue' java.lang.NoClassDefFoundError: Could not initialize class net.fortuna.ical4j.util.CompatibilityHints at net.fortuna.ical4j.model.Iso8601.<init>(Iso8601.java:78) at net.fortuna.ical4j.model.Date.<init>(Date.java:128) at net.fortuna.ical4j.model.DateTime.<init>(DateTime.java:236) at icalendarmodule.actions.Appointment_SendNotification.createCalendar(Appointment_SendNotification.java:197) at icalendarmodule.actions.Appointment_SendNotification.executeAction(Appointment_SendNotification.java:97) at icalendarmodule.actions.Appointment_SendNotification.executeAction(Appointment_SendNotification.java:56) at com.mendix.systemwideinterfaces.core.UserAction.execute(SourceFile:57) at com.mendix.core.actionmanagement.CoreAction.call(SourceFile:457) at hE.b(SourceFile:207) at com.mendix.core.Core.execute(SourceFile:226) at ln.a(SourceFile:69) at mx.a(SourceFile:72) at mw.a(SourceFile:151) at mw.executeAction(SourceFile:98) at com.mendix.systemwideinterfaces.core.UserAction.execute(SourceFile:57) at com.mendix.core.actionmanagement.CoreAction.call(SourceFile:457) at hE.b(SourceFile:207) at com.mendix.core.Core.executeSync(SourceFile:203) at lo.a(SourceFile:60) at mx.a(SourceFile:72) at mw.a(SourceFile:151) at mw.executeAction(SourceFile:98) at com.mendix.systemwideinterfaces.core.UserAction.execute(SourceFile:57) at com.mendix.core.actionmanagement.CoreAction.call(SourceFile:457) at hE.b(SourceFile:207) at com.mendix.core.Core.executeSync(SourceFile:203) at lS.a(SourceFile:60) at mx.a(SourceFile:72) at mw.a(SourceFile:151) at mw.executeAction(SourceFile:98) at com.mendix.systemwideinterfaces.core.UserAction.execute(SourceFile:57) at com.mendix.core.actionmanagement.CoreAction.call(SourceFile:457) at hE.b(SourceFile:207) at com.mendix.core.Core.execute(SourceFile:226) at hK.d(SourceFile:150) at hK.a(SourceFile:108) at com.mendix.externalinterface.connector.RequestDispatching$Worker.a(SourceFile:171) at com.mendix.externalinterface.connector.RequestDispatching$Worker$a.a(SourceFile:162) at com.mendix.externalinterface.connector.RequestDispatching$Worker$a.apply(SourceFile:160) at akka.actor.Actor$class.apply(Actor.scala:545) at com.mendix.externalinterface.connector.RequestDispatching$Worker.apply(SourceFile:156) at akka.actor.LocalActorRef.invoke(ActorRef.scala:910) at akka.dispatch.MessageInvocation.invoke(MessageHandling.scala:25) at akka.dispatch.ExecutableMailbox$class.processMailbox(ExecutorBasedEventDrivenDispatcher.scala:223) at akka.dispatch.ExecutorBasedEventDrivenDispatcher$$anon$4.processMailbox(ExecutorBasedEventDrivenDispatcher.scala:123) at akka.dispatch.ExecutableMailbox$class.run(ExecutorBasedEventDrivenDispatcher.scala:195) at akka.dispatch.ExecutorBasedEventDrivenDispatcher$$anon$4.run(ExecutorBasedEventDrivenDispatcher.scala:123) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918) at java.lang.Thread.run(Thread.java:662) at akka.dispatch.MonitorableThread.run(ThreadPoolBuilder.scala:192)