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java.lang.NullPointerException: 	at de.ovgu.featureide.ui.actions.generator.ConfigurationBuilder$1.showStatistics(ConfigurationBuilder.java:364)	at de.ovgu.featureide.ui.actions.generator.ConfigurationBuilder$1.run(ConfigurationBuilder.java:304)	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)