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java.lang.NullPointerException: 	at org.processmining.log.csvimport.handler.XESConversionHandlerImpl.assignAttribute(XESConversionHandlerImpl.java:246)	at org.processmining.log.csvimport.handler.XESConversionHandlerImpl.assignLifecycleTransition(XESConversionHandlerImpl.java:250)	at org.processmining.log.csvimport.handler.XESConversionHandlerImpl.startEvent(XESConversionHandlerImpl.java:158)	at org.processmining.log.csvimport.CSVConversion.convertCSV(CSVConversion.java:294)	at org.processmining.log.csvimport.CSVConversionPlugin.doConvertCSVToXes(CSVConversionPlugin.java:119)	at org.processmining.log.csvimport.CSVConversionPlugin.convertCSVToXES(CSVConversionPlugin.java:76)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at org.processmining.framework.plugin.impl.PluginDescriptorImpl.execute(PluginDescriptorImpl.java:251)	at org.processmining.framework.plugin.impl.AbstractPluginDescriptor$1.doInBackground(AbstractPluginDescriptor.java:144)	at org.processmining.framework.plugin.ProMFuture$1.doInBackground(ProMFuture.java:56)	at javax.swing.SwingWorker$1.call(Unknown Source)	at java.util.concurrent.FutureTask.run(Unknown Source)	at javax.swing.SwingWorker.run(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)	at java.lang.Thread.run(Unknown Source)