SuperDevMode not working

Hello ,

I am trying to run the application in superDevMode ,But ended up in below exception. Application never launches.

Exception:
SEVERE: Error handling type datajava.lang.AssertionError: This UIObject's element is not set; you may be missing a call to either Composite.initWidget() or UIObject.setElement()    at Unknown.fillInStackTrace_0_g$(org.vaadin.alump.distributionbar.demo.widgetset.DBarDemoWidgetset-0.js@36:8443)    at Unknown.Throwable_3_g$(org.vaadin.alump.distributionbar.demo.widgetset.DBarDemoWidgetset-0.js@8:8398)    at Unknown.Error_3_g$(org.vaadin.alump.distributionbar.demo.widgetset.DBarDemoWidgetset-0.js@18:70561)    at Unknown.AssertionError_7_g$(org.vaadin.alump.distributionbar.demo.widgetset.DBarDemoWidgetset-0.js@14:70615)    at Unknown.makeAssertionError_Object_0_g$(org.vaadin.alump.distributionbar.demo.widgetset.DBarDemoWidgetset-0.js@10:43535)    at Unknown.getElement_0_g$(org.vaadin.alump.distributionbar.demo.widgetset.DBarDemoWidgetset-0.js@42:52959)    at Unknown.initRootElement_0_g$(org.vaadin.alump.distributionbar.demo.widgetset.DBarDemoWidgetset-0.js@35:200807)    at Unknown.getBuilder_0_g$(org.vaadin.alump.distributionbar.demo.widgetset.DBarDemoWidgetset-0.js@23:200316)    at Unknown.GwtDistributionBar_1_g$(org.vaadin.alump.distributionbar.demo.widgetset.DBarDemoWidgetset-0.js@8:200277)    at Unknown.invoke_107_g$(org.vaadin.alump.distributionbar.demo.widgetset.DBarDemoWidgetset-0.js@10:103590)    at Unknown.createInstance_3_g$(org.vaadin.alump.distributionbar.demo.widgetset.DBarDemoWidgetset-0.js@27:111409)    at Unknown.createWidget_0_g$(org.vaadin.alump.distributionbar.demo.widgetset.DBarDemoWidgetset-0.js@37:89511)    at Unknown.getWidget_7_g$(org.vaadin.alump.distributionbar.demo.widgetset.DBarDemoWidgetset-0.js@29:89561)    at Unknown.getWidget_144_g$(org.vaadin.alump.distributionbar.demo.widgetset.DBarDemoWidgetset-0.js@73:200589)    at Unknown.getWidget_143_g$(org.vaadin.alump.distributionbar.demo.widgetset.DBarDemoWidgetset-0.js@15:200585)    at Unknown.registerConnector_0_g$(org.vaadin.alump.distributionbar.demo.widgetset.DBarDemoWidgetset-0.js@27:73678)    at Unknown.createAndRegisterConnector_0_g$(org.vaadin.alump.distributionbar.demo.widgetset.DBarDemoWidgetset-0.js@26:71796)    at Unknown.getConnector_0_g$(org.vaadin.alump.distributionbar.demo.widgetset.DBarDemoWidgetset-0.js@17:71862)    at Unknown.createConnectorsIfNeeded_0_g$(org.vaadin.alump.distributionbar.demo.widgetset.DBarDemoWidgetset-0.js@63:85946)    at Unknown.execute_35_g$(org.vaadin.alump.distributionbar.demo.widgetset.DBarDemoWidgetset-0.js@35:86059)    at Unknown.runWhenDependenciesLoaded_0_g$(org.vaadin.alump.distributionbar.demo.widgetset.DBarDemoWidgetset-0.j

Steps i followed are:
1) Adding <set-configuration-property name="devModeRedirectEnabled" value="true" /> in DBarDemoWidgetset.gwt.gwt.xml
2)Launch the code server with "org.vaadin.alump.distributionbar.demo.widgetset.DBarDemoWidgetset"
3)Launch application on tomcat
4)Open application http://localhost:8080/DistributionBarDemo/?superdevmode

Please let me know if i am missing anything.
I tried to run the demo application of  addon 'distribution-bar'  i,e (dbbar-demo)

Below is the link of source code of the addon https://github.com/alump/VaadinDistributionBar

Any hints on this is greatly appreciated :-)