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java.lang.NullPointerException: 	at org.eclipse.aether.internal.impl.DefaultRepositorySystem.resolveDependencies(DefaultRepositorySystem.java:361)	at com.vaadin.framework8.migrate.MavenResolver.resolve(MavenResolver.java:68)	at com.vaadin.framework8.migrate.VadinJarFinder.download(VadinJarFinder.java:55)	at com.vaadin.framework8.migrate.VadinJarFinder.lambda$get$0(VadinJarFinder.java:22)	at java.util.Optional.orElseGet(Unknown Source)	at com.vaadin.framework8.migrate.VadinJarFinder.get(VadinJarFinder.java:22)	at com.vaadin.framework8.migrate.Migrate.main(Migrate.java:38)