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