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java.lang.NullPointerException: 	at org.netbeans.jcode.mvc.viewer.jsp.JSPViewerGenerator.generateHome(JSPViewerGenerator.java:253)	at org.netbeans.jcode.mvc.viewer.jsp.JSPViewerGenerator.execute(JSPViewerGenerator.java:121)	at org.netbeans.jcode.generator.internal.util.Util.generateCRUD(Util.java:493)	at org.netbeans.jcode.generator.internal.ApplicationGenerator.generate(ApplicationGenerator.java:54)	at org.netbeans.jcode.generator.JEEApplicationGenerator.generate(JEEApplicationGenerator.java:66)	at org.netbeans.jpa.modeler.source.generator.task.SourceCodeGeneratorTask.exportCode(SourceCodeGeneratorTask.java:110)	at org.netbeans.jpa.modeler.source.generator.task.SourceCodeGeneratorTask.begin(SourceCodeGeneratorTask.java:79)	at org.netbeans.jcode.task.AbstractNBTask.beginTask(AbstractNBTask.java:449)	at org.netbeans.jcode.task.AbstractNBTask.run(AbstractNBTask.java:88)	at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1443)	at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:68)	at org.openide.util.lookup.Lookups.executeWith(Lookups.java:303)	at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2058)