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2019-09-12 11:02:07 [ERROR] com.sonicle.webtop.calendar.Service - Error in ImportContactsFromICal2019-09-12 11:02:07 [ERROR] com.sonicle.webtop.calendar.Service - Error in ImportContactsFromICaljava.lang.NullPointerException: null at net.fortuna.ical4j.model.property.DateProperty.hashCode(DateProperty.java:169) at java.util.AbstractList.hashCode(AbstractList.java:541) at org.apache.commons.lang3.builder.HashCodeBuilder.append(HashCodeBuilder.java:844) at net.fortuna.ical4j.model.Component.hashCode(Component.java:254) at java.util.AbstractList.hashCode(AbstractList.java:541) at org.apache.commons.lang3.builder.HashCodeBuilder.append(HashCodeBuilder.java:844) at net.fortuna.ical4j.model.component.VEvent.hashCode(VEvent.java:691) at java.util.WeakHashMap.hash(WeakHashMap.java:298) at java.util.WeakHashMap.put(WeakHashMap.java:449) at org.apache.commons.lang3.builder.ToStringStyle.register(ToStringStyle.java:191) at org.apache.commons.lang3.builder.ToStringStyle.appendClassName(ToStringStyle.java:1453) at org.apache.commons.lang3.builder.ToStringStyle.appendStart(ToStringStyle.java:378) at org.apache.commons.lang3.builder.ToStringBuilder.<init>(ToStringBuilder.java:263) at org.apache.commons.lang3.builder.ToStringBuilder.<init>(ToStringBuilder.java:226) at com.sonicle.webtop.core.util.ICalendarUtils.print(ICalendarUtils.java:183) at com.sonicle.webtop.calendar.io.ICalendarInput.fromICalendarFile(ICalendarInput.java:147) at com.sonicle.webtop.calendar.io.EventICalFileReader.listEvents(EventICalFileReader.java:77) at com.sonicle.webtop.calendar.io.EventICalFileReader.listEvents(EventICalFileReader.java:64) at com.sonicle.webtop.calendar.CalendarManager.importEvents(CalendarManager.java:2068) at com.sonicle.webtop.calendar.Service.processImportEventsFromICal(Service.java:1099) 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 com.sonicle.webtop.core.app.servlet.BaseRequest.invokeMethod(BaseRequest.java:109) at com.sonicle.webtop.core.app.servlet.PrivateRequest.processRequest(PrivateRequest.java:82) at com.sonicle.webtop.core.app.servlet.PrivateRequest.doPost(PrivateRequest.java:104)