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java.lang.NullPointerException: 	at org.aksw.autosparql.tbsl.gui.vaadin.TBSLManager.fetchResult(	at org.aksw.autosparql.tbsl.gui.vaadin.TBSLManager.createAnswer(	at org.aksw.autosparql.tbsl.gui.vaadin.TBSLManager.answerQuestion(	at org.aksw.autosparql.tbsl.gui.vaadin.view.MainView$	at