org.netbeans.api.debugger.jpda.InvalidExpressionException: No current context (stack frame)
        at org.netbeans.modules.debugger.jpda.JPDADebuggerImpl.evaluateIn(JPDADebuggerImpl.java:865)
        at org.netbeans.modules.debugger.jpda.JPDADebuggerImpl.evaluateIn(JPDADebuggerImpl.java:762)
        at org.netbeans.modules.debugger.jpda.JPDADebuggerImpl.evaluate(JPDADebuggerImpl.java:393)
        at org.netbeans.modules.debugger.jpda.JPDADebuggerImpl.evaluate(JPDADebuggerImpl.java:369)
        at org.netbeans.modules.debugger.jpda.models.AbstractObjectVariable.evaluate(AbstractObjectVariable.java:521)
Caused: java.lang.reflect.InvocationTargetException
        at sun.reflect.GeneratedMethodAccessor419.invoke(GeneratedMethodAccessor419.java:0)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.netbeans.modules.debugger.jpda.ui.models.VariablesFormatterFilter.getValueAt(VariablesFormatterFilter.java:294)
        at org.netbeans.modules.debugger.jpda.ui.models.VariablesTreeModelFilter.getValueAt(VariablesTreeModelFilter.java:408)
        at org.netbeans.spi.viewmodel.Models$CompoundTableModel.getValueAt(Models.java:1107)
        at org.netbeans.modules.debugger.jpda.ui.models.BoldVariablesTableModelFilterFirst.getValueAt(BoldVariablesTableModelFilterFirst.java:75)
        at org.netbeans.spi.viewmodel.Models$CompoundTableModel.getValueAt(Models.java:1107)
        at org.netbeans.spi.viewmodel.Models$CompoundModel.getValueAt(Models.java:3286)
        at org.netbeans.modules.viewmodel.TreeModelNode$MyProperty.evaluateLazily(TreeModelNode.java:1032)
        at org.netbeans.modules.viewmodel.TreeModelNode$LazyEvaluator.run(TreeModelNode.java:1253)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:573)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1005)