None of my workflows will open

KNIME Analytics Platform
1

Whenever I open my workflows I get a big red x and they won’t open.

!ENTRY org.eclipse.e4.ui.workbench 4 2 2019-09-27 15:16:41.569
!MESSAGE Problems occurred when invoking code from plug-in: "org.eclipse.e4.ui.workbench".
!STACK 0
java.lang.ClassCastException: org.eclipse.ui.internal.ErrorEditorPart cannot be cast to org.knime.workbench.editor2.WorkflowEditor
	at org.knime.workbench.editor2.actions.AddMetaNodeAction.setActiveEditor(AddMetaNodeAction.java:78)
	at org.eclipse.ui.internal.EditorPluginAction.editorChanged(EditorPluginAction.java:71)
	at org.eclipse.ui.internal.EditorActionBuilder$EditorContribution.editorChanged(EditorActionBuilder.java:80)
	at org.eclipse.ui.internal.EditorActionBuilder$ExternalContributor.setActiveEditor(EditorActionBuilder.java:129)
	at org.eclipse.ui.internal.EditorActionBars.partChanged(EditorActionBars.java:344)
	at org.eclipse.ui.internal.WorkbenchPage.updateActivations(WorkbenchPage.java:311)
	at org.eclipse.ui.internal.WorkbenchPage.access$18(WorkbenchPage.java:293)
	at org.eclipse.ui.internal.WorkbenchPage$E4PartListener.partActivated(WorkbenchPage.java:211)
	at org.eclipse.e4.ui.internal.workbench.PartServiceImpl$3.run(PartServiceImpl.java:250)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
	at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.firePartActivated(PartServiceImpl.java:247)
	at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.activate(PartServiceImpl.java:756)
	at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.activate(PartServiceImpl.java:681)
	at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.activate(PartServiceImpl.java:676)
	at org.eclipse.ui.internal.WorkbenchPage.activate(WorkbenchPage.java:993)
	at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:3222)
	at org.eclipse.ui.internal.WorkbenchPage.access$25(WorkbenchPage.java:3176)
	at org.eclipse.ui.internal.WorkbenchPage$10.run(WorkbenchPage.java:3158)
	at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
	at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:3153)
	at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:3117)
	at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:3098)
	at org.knime.workbench.explorer.view.actions.OpenWorkflowAction.openEditor(OpenWorkflowAction.java:123)
	at org.knime.workbench.explorer.view.ExplorerView.openSelected(ExplorerView.java:412)
	at org.knime.workbench.explorer.view.ExplorerView.access$4(ExplorerView.java:367)
	at org.knime.workbench.explorer.view.ExplorerView$3$1.run(ExplorerView.java:466)
	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:37)
	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:182)
	at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4213)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3820)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1150)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1039)
	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:153)
	at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:680)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:594)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:148)
	at org.knime.product.rcp.KNIMEApplication.start(KNIMEApplication.java:144)
	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:388)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:243)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:653)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:590)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1499)

!ENTRY org.eclipse.e4.ui.workbench 4 0 2019-09-27 15:16:41.569
!MESSAGE An exception occurred while notifying part listeners
!STACK 0
java.lang.ClassCastException: org.eclipse.ui.internal.ErrorEditorPart cannot be cast to org.knime.workbench.editor2.WorkflowEditor
	at org.knime.workbench.editor2.actions.AddMetaNodeAction.setActiveEditor(AddMetaNodeAction.java:78)
	at org.eclipse.ui.internal.EditorPluginAction.editorChanged(EditorPluginAction.java:71)
	at org.eclipse.ui.internal.EditorActionBuilder$EditorContribution.editorChanged(EditorActionBuilder.java:80)
	at org.eclipse.ui.internal.EditorActionBuilder$ExternalContributor.setActiveEditor(EditorActionBuilder.java:129)
	at org.eclipse.ui.internal.EditorActionBars.partChanged(EditorActionBars.java:344)
	at org.eclipse.ui.internal.WorkbenchPage.updateActivations(WorkbenchPage.java:311)
	at org.eclipse.ui.internal.WorkbenchPage.access$18(WorkbenchPage.java:293)
	at org.eclipse.ui.internal.WorkbenchPage$E4PartListener.partActivated(WorkbenchPage.java:211)
	at org.eclipse.e4.ui.internal.workbench.PartServiceImpl$3.run(PartServiceImpl.java:250)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
	at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.firePartActivated(PartServiceImpl.java:247)
	at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.activate(PartServiceImpl.java:756)
	at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.activate(PartServiceImpl.java:681)
	at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.activate(PartServiceImpl.java:676)
	at org.eclipse.ui.internal.WorkbenchPage.activate(WorkbenchPage.java:993)
	at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:3222)
	at org.eclipse.ui.internal.WorkbenchPage.access$25(WorkbenchPage.java:3176)
	at org.eclipse.ui.internal.WorkbenchPage$10.run(WorkbenchPage.java:3158)
	at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
	at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:3153)
	at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:3117)
	at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:3098)
	at org.knime.workbench.explorer.view.actions.OpenWorkflowAction.openEditor(OpenWorkflowAction.java:123)
	at org.knime.workbench.explorer.view.ExplorerView.openSelected(ExplorerView.java:412)
	at org.knime.workbench.explorer.view.ExplorerView.access$4(ExplorerView.java:367)
	at org.knime.workbench.explorer.view.ExplorerView$3$1.run(ExplorerView.java:466)
	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:37)
	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:182)
	at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4213)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3820)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1150)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1039)
	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:153)
	at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:680)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:594)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:148)
	at org.knime.product.rcp.KNIMEApplication.start(KNIMEApplication.java:144)
	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:388)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:243)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:653)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:590)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1499)

How do I fix this?

2

Things to try in order of least work to most work:
. making a new workflow - does this open?
. creating a new workspace in your existing KAP then making a new workflow (if the first one did not work) - does this open?
. creating a new workspace in your existing KAP then importing a workflow from the old workspace
. installing a fresh KAP and running it with a newly created workspace

… and the usual forensics questions…
. what version of KAP
. what operating system
. any recent changes to KAP (e.g new extensions installed)

4 Likes
3

In addition to what @quaeler is suggesting:

  • Try to start KNIME with the clean option
  • do you use any remote storage functions like OneDrive to store your data?
4 Likes
4

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