RSSOwl not WORKING !!,Reoccurring internal error. even AFTER REINSTALL OF THE SOFTWARE

[neo bondhu]

Hello,
THIS PROBLEM IS BUGGING ME FOR QUITE SOME TIME.
After I install & start RSSOwl,
the following error shows in the Left Column, & there's no other options to recover from here.
Also, THE STRANGE THING is that:
whenever, I try to reinstall the software, after a THROUGH COMPLETE UNINSTALL, (even from CCleaner Uninstall), this following error show, AGAIN, AGAIN & AGAIN. I've even made a clean Registry File with my CCleaner registry fix,
so my QUESTIONS ARE:
1.How Can I make a clean install of this software?
2.How to fix the errors as shown below?
3. If above options fail, how can I remove it from my registry?(this is really bugging me a lot):

Error:

"<<
Could not create the view: An unexpected exception was thrown.
java.lang.NullPointerException
at org.eclipse.jface.viewers.ViewerComparator.compare(Unknown Source)
at org.rssowl.ui.internal.views.explorer.BookMarkSorter.compare(BookMarkSorter.java:97)
at org.eclipse.jface.viewers.ViewerComparator$1.compare(Unknown Source)
at java.util.Arrays.mergeSort(Unknown Source)
at java.util.Arrays.legacyMergeSort(Unknown Source)
at java.util.Arrays.sort(Unknown Source)
at org.eclipse.jface.viewers.ViewerComparator.sort(Unknown Source)
at org.eclipse.jface.viewers.AbstractTreeViewer.getSortedChildren(Unknown Source)
at org.eclipse.jface.viewers.AbstractTreeViewer$1.run(Unknown Source)
at org.eclipse.swt.custom.BusyIndicator.showWhile(Unknown Source)
at org.eclipse.jface.viewers.AbstractTreeViewer.createChildren(Unknown Source)
at org.eclipse.jface.viewers.TreeViewer.createChildren(Unknown Source)
at org.rssowl.ui.internal.views.explorer.BookMarkViewer.createChildren(BookMarkViewer.java:73)
at org.eclipse.jface.viewers.AbstractTreeViewer.setExpandedState(Unknown Source)
at org.rssowl.ui.internal.views.explorer.BookMarkExplorer.restoreExpandedElements(BookMarkExplorer.java:1898)
at org.rssowl.ui.internal.views.explorer.BookMarkExplorer.createPartControl(BookMarkExplorer.java:259)
at org.eclipse.ui.internal.ViewReference.createPartHelper(Unknown Source)
at org.eclipse.ui.internal.ViewReference.createPart(Unknown Source)
at org.eclipse.ui.internal.WorkbenchPartReference.getPart(Unknown Source)
at org.eclipse.ui.internal.WorkbenchPage$ActivationList.setActive(Unknown Source)
at org.eclipse.ui.internal.WorkbenchPage$17.runWithException(Unknown Source)
at org.eclipse.ui.internal.StartupThreading$StartupRunnable.run(Unknown Source)
at org.eclipse.swt.widgets.RunnableLock.run(Unknown Source)
at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Unknown Source)
at org.eclipse.swt.widgets.Display.runAsyncMessages(Unknown Source)
at org.eclipse.swt.widgets.Display.readAndDispatch(Unknown Source)
at org.eclipse.ui.application.WorkbenchAdvisor.openWindows(Unknown Source)
at org.eclipse.ui.internal.Workbench$27.runWithException(Unknown Source)
at org.eclipse.ui.internal.StartupThreading$StartupRunnable.run(Unknown Source)
at org.eclipse.swt.widgets.RunnableLock.run(Unknown Source)
at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Unknown Source)
at org.eclipse.swt.widgets.Display.runAsyncMessages(Unknown Source)
at org.eclipse.swt.widgets.Display.readAndDispatch(Unknown Source)
at org.eclipse.ui.internal.Workbench.runUI(Unknown Source)
at org.eclipse.ui.internal.Workbench.access$4(Unknown Source)
at org.eclipse.ui.internal.Workbench$5.run(Unknown Source)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Unknown Source)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Unknown Source)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(Unknown Source)
at org.rssowl.ui.internal.Application.start(Application.java:119)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(Unknown Source)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(Unknown Source)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(Unknown Source)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(Unknown Source)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.equinox.launcher.Main.invokeFramework(Unknown Source)
at org.eclipse.equinox.launcher.Main.basicRun(Unknown Source)
at org.eclipse.equinox.launcher.Main.run(Unknown Source)

"