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java.lang.NullPointerException: null at org.simpleframework.xml.convert.Reference.getType(Reference.java:70)[simple-xml-jar-2.6.9.jar:na] at org.simpleframework.xml.core.Factory.getOverride(Factory.java:143)[simple-xml-jar-2.6.9.jar:na] at org.simpleframework.xml.core.ObjectFactory.getInstance(ObjectFactory.java:63)[simple-xml-jar-2.6.9.jar:na] at org.simpleframework.xml.core.Composite.read(Composite.java:139)[simple-xml-jar-2.6.9.jar:na] at org.simpleframework.xml.core.Composite.readVariable(Composite.java:623)[simple-xml-jar-2.6.9.jar:na] at org.simpleframework.xml.core.Composite.readInstance(Composite.java:573)[simple-xml-jar-2.6.9.jar:na] at org.simpleframework.xml.core.Composite.readUnion(Composite.java:549)[simple-xml-jar-2.6.9.jar:na] at org.simpleframework.xml.core.Composite.readElement(Composite.java:532)[simple-xml-jar-2.6.9.jar:na] at org.simpleframework.xml.core.Composite.readElements(Composite.java:445)[simple-xml-jar-2.6.9.jar:na] at org.simpleframework.xml.core.Composite.access$400(Composite.java:59)[simple-xml-jar-2.6.9.jar:na] at org.simpleframework.xml.core.Composite$Builder.read(Composite.java:1383)[simple-xml-jar-2.6.9.jar:na] at org.simpleframework.xml.core.Composite.read(Composite.java:201)[simple-xml-jar-2.6.9.jar:na] at org.simpleframework.xml.core.Composite.read(Composite.java:148)[simple-xml-jar-2.6.9.jar:na] at org.simpleframework.xml.core.Traverser.read(Traverser.java:92)[simple-xml-jar-2.6.9.jar:na] at org.simpleframework.xml.core.Persister.read(Persister.java:625)[simple-xml-jar-2.6.9.jar:na] at org.simpleframework.xml.core.Persister.read(Persister.java:606)[simple-xml-jar-2.6.9.jar:na] at org.simpleframework.xml.core.Persister.read(Persister.java:584)[simple-xml-jar-2.6.9.jar:na] at org.apache.openmeetings.servlet.outputhandler.BackupImportController.readUserList(BackupImportController.java:737)[openmeetings-2.2.0-RELEASE.jar:na] at org.apache.openmeetings.servlet.outputhandler.BackupImportController.readUserList(BackupImportController.java:691)[openmeetings-2.2.0-RELEASE.jar:na] at org.apache.openmeetings.servlet.outputhandler.BackupImportController.performImport(BackupImportController.java:245)[openmeetings-2.2.0-RELEASE.jar:na] at org.apache.openmeetings.cli.Admin.restoreOm(Admin.java:623)[openmeetings-2.2.0-RELEASE.jar:na] at org.apache.openmeetings.cli.Admin.process(Admin.java:269)[openmeetings-2.2.0-RELEASE.jar:na] at org.apache.openmeetings.cli.Admin.main(Admin.java:630)[openmeetings-2.2.0-RELEASE.jar:na]