I tried to install a prolog plugin called Prolog Development Tool from http://sewiki.iai.uni-bonn.de/public-downloads/update-site/site.xml in eclipse. I was able to install it successfully but when I tried creating a prolog project, I got an error Could not open the editor: An unknown exception was thrown.
java.lang.NullPointerException at org.cs3.pdt.internal.editors.PLConfiguration.reinitScanner(PLConfiguration.java:123) at org.cs3.pdt.internal.editors.PLConfiguration.getPLScanner(PLConfiguration.java:110) at org.cs3.pdt.internal.editors.PLConfiguration.getPresentationReconciler(PLConfiguration.java:136) at org.eclipse.jface.text.source.SourceViewer.configure(SourceViewer.java:362) at org.eclipse.ui.texteditor.AbstractTextEditor.createPartControl(AbstractTextEditor.java:3233) at org.eclipse.ui.texteditor.StatusTextEditor.createPartControl(StatusTextEditor.java:53) at org.eclipse.ui.texteditor.AbstractDecoratedTextEditor.createPartControl(AbstractDecoratedTextEditor.java:394) at org.cs3.pdt.internal.editors.PLEditor.createPartControl_impl(PLEditor.java:203) at org.cs3.pdt.internal.editors.PLEditor.createPartControl(PLEditor.java:195) at org.eclipse.ui.internal.EditorReference.createPartHelper(EditorReference.java:661) at org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:428) at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:594) at org.eclipse.ui.internal.PartPane.setVisible(PartPane.java:306) at org.eclipse.ui.internal.presentations.PresentablePart.setVisible(PresentablePart.java:180) at org.eclipse.ui.internal.presentations.util.PresentablePartFolder.select(PresentablePartFolder.java:270) at org.eclipse.ui.internal.presentations.util.LeftToRightTabOrder.select(LeftToRightTabOrder.java:65) at org.eclipse.ui.internal.presentations.util.TabbedStackPresentation.selectPart(TabbedStackPresentation.java:473) at org.eclipse.ui.internal.PartStack.refreshPresentationSelection(PartStack.java:1256) at org.eclipse.ui.internal.PartStack.setSelection(PartStack.java:1209) at org.eclipse.ui.internal.PartStack.showPart(PartStack.java:1608) at org.eclipse.ui.internal.PartStack.add(PartStack.java:499) at org.eclipse.ui.internal.EditorStack.add(EditorStack.java:103) at org.eclipse.ui.internal.PartStack.add(PartStack.java:485) at org.eclipse.ui.internal.EditorStack.add(EditorStack.java:112) at org.eclipse.ui.internal.EditorSashContainer.addEditor(EditorSashContainer.java:63) at org.eclipse.ui.internal.EditorAreaHelper.addToLayout(EditorAreaHelper.java:217) at org.eclipse.ui.internal.EditorAreaHelper.addEditor(EditorAreaHelper.java:207) at org.eclipse.ui.internal.EditorManager.createEditorTab(EditorManager.java:779) at org.eclipse.ui.internal.EditorManager.openEditorFromDescriptor(EditorManager.java:678) at org.eclipse.ui.internal.EditorManager.openEditor(EditorManager.java:639) at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditorBatched(WorkbenchPage.java:2817) at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:2729) at org.eclipse.ui.internal.WorkbenchPage.access$11(WorkbenchPage.java:2721) at org.eclipse.ui.internal.WorkbenchPage$10.run(WorkbenchPage.java:2673) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70) at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2668) at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2652) at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2643) at org.eclipse.ui.ide.IDE.openEditor(IDE.java:646) at org.eclipse.ui.ide.IDE.openEditor(IDE.java:605) at org.eclipse.ui.wizards.newresource.BasicNewFileResourceWizard.performFinish(BasicNewFileResourceWizard.java:111) at org.eclipse.jface.wizard.WizardDialog.finishPressed(WizardDialog.java:742) at org.eclipse.jface.wizard.WizardDialog.buttonPressed(WizardDialog.java:373) at org.eclipse.jface.dialogs.Dialog$2.widgetSelected(Dialog.java:624) at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:228) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1158) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3401) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3033) at org.eclipse.jface.window.Window.runEventLoop(Window.java:825) at org.eclipse.jface.window.Window.open(Window.java:801) at org.eclipse.ui.internal.actions.NewWizardShortcutAction.run(NewWizardShortcutAction.java:135) at org.eclipse.jface.action.Action.runWithEvent(Action.java:498) at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:583) at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:500) at org.eclipse.jface.action.ActionContributionItem$5.handleEvent(ActionContributionItem.java:411) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1158) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3401) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3033) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2382) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2346) at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2198) at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:493) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:288) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:488) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:113) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:193) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:386) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:549) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:504) at org.eclipse.equinox.launcher.Main.run(Main.java:1236)
Can anyone suggest what the problem is all about? I am a newbie in prolog. When I create a project, I am not allowed any option to choose Prolog project, so I created a general project. When I tried creating a file using .pl extension, it gives me this option to convert the project into Prolog project and once it is done the above error is projected. I have no clue what is going on.