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java.lang.NullPointerException: 	at edu.emory.mathcs.backport.java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:769)	at net.fortuna.ical4j.model.TimeZoneRegistryImpl.getTimeZone(TimeZoneRegistryImpl.java:137)	at com.atlassian.confluence.extra.calendar3.DefaultJodaIcal4jTimeZoneMapper.getIcal4jTimeZone(DefaultJodaIcal4jTimeZoneMapper.java:116)	at com.atlassian.confluence.extra.calendar3.DefaultCalendarManager.getSubCalendarTimeZone(DefaultCalendarManager.java:423)	at com.atlassian.confluence.extra.calendar3.DefaultCalendarManager.getEvents(DefaultCalendarManager.java:574)	at com.atlassian.confluence.extra.calendar3.rest.CalendarResource$9.doInTransaction(CalendarResource.java:685)	at com.atlassian.confluence.extra.calendar3.rest.CalendarResource$9.doInTransaction(CalendarResource.java:651)	at com.atlassian.sal.core.transaction.HostContextTransactionTemplate$1.doInTransaction(HostContextTransactionTemplate.java:25)	at com.atlassian.sal.spring.component.SpringHostContextAccessor$1.doInTransaction(SpringHostContextAccessor.java:88)	at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:128)	at com.atlassian.sal.spring.component.SpringHostContextAccessor.doInTransaction(SpringHostContextAccessor.java:82)	at sun.reflect.GeneratedMethodAccessor92.invoke(Unknown Source)