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java.lang.NullPointerException: 	at org.aksw.autosparql.tbsl.gui.vaadin.TBSLManager.fetchResult(TBSLManager.java:419)	at org.aksw.autosparql.tbsl.gui.vaadin.TBSLManager.createAnswer(TBSLManager.java:384)	at org.aksw.autosparql.tbsl.gui.vaadin.TBSLManager.answerQuestion(TBSLManager.java:345)	at org.aksw.autosparql.tbsl.gui.vaadin.view.MainView$11.run(MainView.java:504)	at java.lang.Thread.run(Thread.java:744)