NPE while dragging an expression onto the stage

[GoogleCodeExporter]

15:24:55,608 [AWT-EventQueue-0] DEBUG: ControlPanelManagerImpl.buildExpression()
15:24:56,892 [SwingWorker-pool-1-thread-1] DEBUG: 
ControlPanelManagerImpl.loadExpression()
15:24:56,892 [SwingWorker-pool-1-thread-1] DEBUG:    Loading operations into 
service [::TeRK::led::SimpleLEDService]
15:24:56,911 [SwingWorker-pool-1-thread-1] ERROR: Exception caught while 
executing executeTimeConsumingAction().  Returning null object.
java.lang.NullPointerException
    at edu.cmu.ri.createlab.expressionbuilder.ExpressionFileManagerControlsView$OpenExpressionAction.executeTimeConsumingAction(ExpressionFileManagerControlsView.java:190)
    at edu.cmu.ri.createlab.userinterface.util.AbstractTimeConsumingAction$1$1.doInBackground(AbstractTimeConsumingAction.java:77)
    at javax.swing.SwingWorker$1.call(SwingWorker.java:277)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
    at java.util.concurrent.FutureTask.run(FutureTask.java:138)
    at javax.swing.SwingWorker.run(SwingWorker.java:316)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:680)
15:24:59,267 [AWT-EventQueue-0] DEBUG: Creating Icon Block

Original issue reported on code.google.com by garthabr...@gmail.com on 24 Oct 2011 at 10:11