[Jadclipse-develop] [Help] "Could not open editor" Error

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The following forum message was posted by kv7 at http://sourceforge.net/projects/jadclipse/forums/forum/124755/topic/4402669:

Trying to install jadclipse on a windows machine with eclipse 1.3.2, followed
the steps listed here (http://jadclipse.sourceforge.net/install.html) including
configuring the path as they describe. Getting weird errors, and I can't tell
if they're part of jad or the code that I'm trying to open, but look like this.
Any help appreciated!

Could not open the editor: The editor class could not be instantiated. This
usually indicates a missing no-arg constructor or that the editor's class name
was mistyped in plugin.xml.

And when you look at the details, they list:

java.lang.NoClassDefFoundError: org/eclipse/jdt/internal/core/SourceRange
	at java.lang.Class.getDeclaredConstructors0(Native Method)
	at java.lang.Class.privateGetDeclaredConstructors(Unknown Source)
	at java.lang.Class.getConstructor0(Unknown Source)
	at java.lang.Class.newInstance0(Unknown Source)
	at java.lang.Class.newInstance(Unknown Source)
	at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.createExecutabl
eExtension(RegistryStrategyOSGI.java:184)
	at org.eclipse.core.internal.registry.ExtensionRegistry.createExecutableExtensi
on(ExtensionRegistry.java:904)
	at org.eclipse.core.internal.registry.ConfigurationElement.createExecutableExte
nsion(ConfigurationElement.java:243)
	at org.eclipse.core.internal.registry.ConfigurationElementHandle.createExecutab
leExtension(ConfigurationElementHandle.java:55)
	at org.eclipse.ui.internal.WorkbenchPlugin$1.run(WorkbenchPlugin.java:267)
	at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
	at org.eclipse.ui.internal.WorkbenchPlugin.createExtension(WorkbenchPlugin.java
:263)
	at org.eclipse.ui.internal.registry.EditorDescriptor.createEditor(EditorDescrip
tor.java:235)
	at org.eclipse.ui.internal.EditorManager.createPart(EditorManager.java:845)
	at org.eclipse.ui.internal.EditorReference.createPartHelper(EditorReference.jav
a:609)
	at org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:465)
	at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReferenc
e.java:595)
	at org.eclipse.ui.internal.PartPane.setVisible(PartPane.java:313)
	at org.eclipse.ui.internal.presentations.PresentablePart.setVisible(Presentable
Part.java:180)
	at org.eclipse.ui.internal.presentations.util.PresentablePartFolder.select(Pres
entablePartFolder.java:270)
	at org.eclipse.ui.internal.presentations.util.LeftToRightTabOrder.select(LeftTo
RightTabOrder.java:65)
	at org.eclipse.ui.internal.presentations.util.TabbedStackPresentation.selectPar
t(TabbedStackPresentation.java:473)
	at org.eclipse.ui.internal.PartStack.refreshPresentationSelection(PartStack.jav
a:1254)
	at org.eclipse.ui.internal.PartStack.setSelection(PartStack.java:1207)
	at org.eclipse.ui.internal.PartStack.showPart(PartStack.java:1606)
	at org.eclipse.ui.internal.PartStack.add(PartStack.java:497)
	at org.eclipse.ui.internal.EditorStack.add(EditorStack.java:103)
	at org.eclipse.ui.internal.PartStack.add(PartStack.java:483)
	at org.eclipse.ui.internal.EditorStack.add(EditorStack.java:112)
	at org.eclipse.ui.internal.EditorSashContainer.addEditor(EditorSashContainer.ja
va:63)
	at org.eclipse.ui.internal.EditorAreaHelper.addToLayout(EditorAreaHelper.java:2
25)
	at org.eclipse.ui.internal.EditorAreaHelper.addEditor(EditorAreaHelper.java:213
)
	at org.eclipse.ui.internal.EditorManager.createEditorTab(EditorManager.java:778
)
	at org.eclipse.ui.internal.EditorManager.openEditorFromDescriptor(EditorManager
.java:677)
	at org.eclipse.ui.internal.EditorManager.openEditor(EditorManager.java:638)
	at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditorBatched(WorkbenchPage.ja
va:2860)
	at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:2768
)
	at org.eclipse.ui.internal.WorkbenchPage.access$11(WorkbenchPage.java:2760)
	at org.eclipse.ui.internal.WorkbenchPage$10.run(WorkbenchPage.java:2711)
	at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
	at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2707)
	at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2691)
	at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2674)
	at org.eclipse.ui.ide.IDE.openEditorOnFileStore(IDE.java:1155)
	at org.eclipse.ui.internal.ide.actions.OpenLocalFileAction.run(OpenLocalFileAct
ion.java:107)
	at org.eclipse.ui.internal.ide.actions.OpenLocalFileAction.run(OpenLocalFileAct
ion.java:76)
	at org.eclipse.ui.internal.PluginAction.runWithEvent(PluginAction.java:251)
	at org.eclipse.ui.internal.WWinPluginAction.runWithEvent(WWinPluginAction.java:
229)
	at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(Action
ContributionItem.java:584)
	at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionI
tem.java:501)
	at org.eclipse.jface.action.ActionContributionItem$5.handleEvent(ActionContribu
tionItem.java:411)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventT