#36 Workflow editor: Unable to create part

[Michael Nash]

Following the doc for the Workflow editor, I get as far as
clicking on a flow, and get a message in Eclipse about "Unable
to create part", followed by "An error has occurred when
activating this view".

The stack in Eclipse is:

java.lang.NullPointerException
>...at
org.eclipse.gef.ui.actions.ActionBarContributor.setActiveEditor(ActionBarContributor.java:137)
>...at
org.eclipse.ui.internal.EditorActionBars.partChanged(EditorActionBars.java:176)
>...at
org.eclipse.ui.internal.WorkbenchPage$2.run(WorkbenchPage.java:427)
>...at
org.eclipse.core.internal.runtime.InternalPlatform.run(InternalPlatform.java:1006)
>...at org.eclipse.core.runtime.Platform.run(Platform.java:413)
>...at
org.eclipse.ui.internal.WorkbenchPage.activatePart(WorkbenchPage.java:419)
>...at
org.eclipse.ui.internal.WorkbenchPage.setActivePart(WorkbenchPage.java:2490)
>...at
org.eclipse.ui.internal.WorkbenchPage.activate(WorkbenchPage.java:408)
>...at
org.eclipse.ui.internal.WorkbenchPage.showEditor(WorkbenchPage.java:2097)
>...at
org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:2037)
>...at
org.eclipse.ui.internal.WorkbenchPage.access$6(WorkbenchPage.java:2004)
>...at
org.eclipse.ui.internal.WorkbenchPage$9.run(WorkbenchPage.java:1991)
>...at
org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:69)

More of the stack available if you need it...