When trying to open a .rb file of approx 1500 lines, Aptana fails with: Unable to create this part due to an internal error. Reason for the failure: Assertion failed: org.eclipse.jface.text.Assert$AssertionFailedException: Assertion failed: at org.eclipse.jface.text.Assert.isTrue(Assert.java:188) at org.eclipse.jface.text.Assert.isTrue(Assert.java:173) at org.eclipse.jface.text.Position.setLength(Position.java:183) at org.eclipse.jface.text.rules.FastPartitioner.computePartitioning(FastPartitioner.java:634) at org.eclipse.jface.text.AbstractDocument.computePartitioning(AbstractDocument.java:1301) at org.eclipse.jface.text.TextUtilities.computePartitioning(TextUtilities.java:426) at org.eclipse.jface.text.presentation.PresentationReconciler.createPresentation(PresentationReconciler.java:443) at org.eclipse.jface.text.presentation.PresentationReconciler.processDamage(PresentationReconciler.java:560) at org.eclipse.jface.text.presentation.PresentationReconciler.access$3(PresentationReconciler.java:558) at org.eclipse.jface.text.presentation.PresentationReconciler$InternalListener.inputDocumentChanged(PresentationReconciler.java:118) at org.eclipse.jface.text.TextViewer.fireInputDocumentChanged(TextViewer.java:2458) at org.eclipse.jface.text.TextViewer.setDocument(TextViewer.java:2507) at org.eclipse.jface.text.source.SourceViewer.setDocument(SourceViewer.java:521) at org.eclipse.jface.text.source.projection.ProjectionViewer.setDocument(ProjectionViewer.java:370) at org.eclipse.jface.text.source.SourceViewer.setDocument(SourceViewer.java:467) at org.eclipse.ui.texteditor.AbstractTextEditor.initializeSourceViewer(AbstractTextEditor.java:2937) at org.eclipse.ui.texteditor.AbstractTextEditor.createPartControl(AbstractTextEditor.java:2684) at org.eclipse.ui.texteditor.StatusTextEditor.createPartControl(StatusTextEditor.java:53) at org.eclipse.ui.texteditor.AbstractDecoratedTextEditor.createPartControl(AbstractDecoratedTextEditor.java:367) at org.rubypeople.rdt.internal.ui.rubyeditor.RubyAbstractEditor.createPartControl(RubyAbstractEditor.java:340) at org.rubypeople.rdt.internal.ui.rubyeditor.RubyEditor.createPartControl(RubyEditor.java:349) at org.eclipse.ui.internal.EditorReference.createPartHelper(EditorReference.java:596) at org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:372) at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:566) at org.eclipse.ui.internal.EditorReference.getEditor(EditorReference.java:214) at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditorBatched(WorkbenchPage.java:2595) at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:2528) at org.eclipse.ui.internal.WorkbenchPage.access$10(WorkbenchPage.java:2520) at org.eclipse.ui.internal.WorkbenchPage$9.run(WorkbenchPage.java:2505) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:67) at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2500) at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2485) at org.eclipse.ui.ide.IDE.openEditor(IDE.java:388) at org.eclipse.ui.ide.IDE.openEditor(IDE.java:350) at org.rubypeople.rdt.internal.ui.rubyeditor.EditorUtility.openInEditor(EditorUtility.java:83) at org.rubypeople.rdt.internal.ui.rubyeditor.EditorUtility.openInEditor(EditorUtility.java:70) at org.rubypeople.rdt.internal.ui.actions.OpenActionUtil.open(OpenActionUtil.java:19) at org.rubypeople.rdt.ui.actions.OpenAction.run(OpenAction.java:164) at org.rubypeople.rdt.ui.actions.OpenAction.run(OpenAction.java:148) at org.rubypeople.rdt.ui.actions.SelectionDispatchAction.dispatchRun(SelectionDispatchAction.java:239) at org.rubypeople.rdt.ui.actions.SelectionDispatchAction.run(SelectionDispatchAction.java:217) at org.rubypeople.rdt.internal.ui.packageview.RubyExplorerActionGroup.handleOpen(RubyExplorerActionGroup.java:293) at org.rubypeople.rdt.internal.ui.packageview.PackageExplorerPart$4.open(PackageExplorerPart.java:637) at org.eclipse.jface.viewers.StructuredViewer$2.run(StructuredViewer.java:817) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37) at org.eclipse.core.runtime.Platform.run(Platform.java:843) at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:44) at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:149) at org.eclipse.jface.viewers.StructuredViewer.fireOpen(StructuredViewer.java:815) at org.eclipse.jface.viewers.StructuredViewer.handleOpen(StructuredViewer.java:1069) at org.eclipse.jface.viewers.StructuredViewer$6.handleOpen(StructuredViewer.java:1168) at org.eclipse.jface.util.OpenStrategy.fireOpenEvent(OpenStrategy.java:249) at org.eclipse.jface.util.OpenStrategy.access$2(OpenStrategy.java:243) at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:283) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:938) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3682) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3293) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1930) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1894) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:422) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) at com.aptana.ide.rcp.AbstractIDEApplication.run(AbstractIDEApplication.java:116) at com.aptana.ide.rcp.Application.run(Application.java:43) at org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:78) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:92) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:68) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:400) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:177) 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.core.launcher.Main.invokeFramework(Main.java:336) at org.eclipse.core.launcher.Main.basicRun(Main.java:280) at org.eclipse.core.launcher.Main.run(Main.java:977) at org.eclipse.core.launcher.Main.main(Main.java:952)