Ctrl+N, select Page Flow and Next or Finish gives multiple errors and the dialog is just stuck:

java.lang.IllegalArgumentException: Path must include project and resource name: /
at org.eclipse.core.runtime.Assert.isLegal(Assert.java:62)
at org.eclipse.core.internal.resources.Workspace.newResource(Workspace.java:1625)
at org.eclipse.core.internal.resources.Container.getFolder(Container.java:137)
at org.jbpm.ui.pageflow.wizard.NewPageFlowWizardPage.getProcessFolder(Unknown Source)
at org.jbpm.ui.pageflow.wizard.NewPageFlowWizard.performFinish(Unknown Source)
at org.eclipse.jface.wizard.WizardDialog.finishPressed(WizardDialog.java:742

java.lang.NullPointerException
at org.jbpm.ui.pageflow.wizard.NewPageFlowWizardPage.getRootForEmbeddingProject(Unknown Source)
at org.jbpm.ui.pageflow.wizard.NewPageFlowWizardPage.initContainerName(Unknown Source)
at org.jbpm.ui.pageflow.wizard.NewPageFlowWizardPage.init(Unknown Source)
at org.jbpm.ui.pageflow.wizard.NewPageFlowWizard.addPages(Unknown Source)
at org.eclipse.jface.wizard.WizardSelectionPage.getNextPage(WizardSelectionPage.java:113)

java.lang.IllegalArgumentException: Argument cannot be null
at org.eclipse.swt.SWT.error(SWT.java:3547)
at org.eclipse.swt.SWT.error(SWT.java:3481)
at org.eclipse.swt.SWT.error(SWT.java:3452)
at org.eclipse.swt.widgets.Widget.error(Widget.java:438)
at org.eclipse.swt.widgets.Text.setText(Text.java:1870)
at org.jbpm.ui.pageflow.wizard.NewPageFlowWizardPage.createContainerField(Unknown Source)
at org.jbpm.ui.pageflow.wizard.NewPageFlowWizardPage.createControl(Unknown Source)
at org.eclipse.jface.wizard.Wizard.createPageControls(Wizard.java:170)
at org.eclipse.jface.wizard.WizardDialog.createPageControls(WizardDialog.java:669)
at org.eclipse.jface.wizard.WizardDialog.setWizard(WizardDialog.java:1083)
at org.eclipse.jface.wizard.WizardDialog.updateForPage(WizardDialog.java:1142)