Hi,
    I got this error when running any workflow in 
taverna-nightly-2.1-beta-3-SNAPSHOT-20091112, when I uncheck "Enable 
provenance capture" in preference.

Exception occurred during event dispatching:
java.lang.NullPointerException
        at 
net.sf.taverna.t2.workbench.run.DataflowRun.<init>(DataflowRun.java:112)
        at 
net.sf.taverna.t2.workbench.run.DataflowRunsComponent.runDataflow(DataflowRunsComponent.j
ava:359)
        at 
net.sf.taverna.t2.workbench.run.actions.RunWorkflowAction$3.handleLaunch(RunWorkflowActio
n.java:350)
        at 
net.sf.taverna.t2.reference.ui.WorkflowLaunchPanel$1.actionPerformed(WorkflowLaunchPanel.
java:160)
        at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
        at javax.swing.AbstractButton$Handler.actionPerformed(Unknown 
Source)
        at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown 
Source)
        at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
        at 
javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
        at java.awt.Component.processMouseEvent(Unknown Source)
        at javax.swing.JComponent.processMouseEvent(Unknown Source)
        at java.awt.Component.processEvent(Unknown Source)
        at java.awt.Container.processEvent(Unknown Source)
        at java.awt.Component.dispatchEventImpl(Unknown Source)
        at java.awt.Container.dispatchEventImpl(Unknown Source)
        at java.awt.Component.dispatchEvent(Unknown Source)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
        at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
        at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
        at java.awt.Container.dispatchEventImpl(Unknown Source)
        at java.awt.Window.dispatchEventImpl(Unknown Source)
        at java.awt.Component.dispatchEvent(Unknown Source)
        at java.awt.EventQueue.dispatchEvent(Unknown Source)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown 
Source)
        at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
        at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
        at java.awt.Dialog$1.run(Unknown Source)
        at java.awt.Dialog$3.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.awt.Dialog.show(Unknown Source)
        at java.awt.Component.show(Unknown Source)
        at java.awt.Component.setVisible(Unknown Source)
        at java.awt.Window.setVisible(Unknown Source)
        at java.awt.Dialog.setVisible(Unknown Source)
        at 
net.sf.taverna.t2.workbench.run.actions.RunWorkflowAction.showInputDialog(RunWorkflowActi
on.java:382)
        at 
net.sf.taverna.t2.workbench.run.actions.RunWorkflowAction.access$300(RunWorkflowAction.ja
va:81)
        at 
net.sf.taverna.t2.workbench.run.actions.RunWorkflowAction$2.run(RunWorkflowAction.java:22
5)
        at java.awt.event.InvocationEvent.dispatch(Unknown Source)
        at java.awt.EventQueue.dispatchEvent(Unknown Source)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown 
Source)
        at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown 
Source)
        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
        at java.awt.EventDispatchThread.run(Unknown Source)

   Any idea?
Wei











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