NullPointerException occurs when select "Build Gem" from a Ruby Project

Steps to Reproduce:
1. Install NB Trunk build (07/30/2008)
2. Create a Ruby Project with having some basic syntax such as below:

    puts "Hello World"
    for ss in 1...10	
      print ss, " Hello\n";
    end
3. Select to Run the project
Note:
   The project run successfully
4. Select Build Gem menu
BUG:
    Exception occurs as listed in the message below (messages.log file attached)

java.lang.NullPointerException
	at org.netbeans.modules.ruby.rubyproject.rake.RakeRunner.doStandardConfiguration(RakeRunner.java:317)
	at org.netbeans.modules.ruby.rubyproject.rake.RakeRunner.getExecutionDescriptors(RakeRunner.java:257)
	at org.netbeans.modules.ruby.rubyproject.rake.RakeRunner.run(RakeRunner.java:222)
	at org.netbeans.modules.ruby.rubyproject.rake.RakeRunner.run(RakeRunner.java:172)
	at org.netbeans.modules.ruby.rubyproject.RubyActionProvider.invokeAction(RubyActionProvider.java:532)
	at org.netbeans.modules.project.ui.actions.ProjectAction.actionPerformed(ProjectAction.java:129)
	at org.netbeans.modules.project.ui.actions.LookupSensitiveAction.actionPerformed(LookupSensitiveAction.java:160)
	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
	at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
	at javax.swing.AbstractButton.doClick(AbstractButton.java:357)
	at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1170)
	at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:1211)
	at java.awt.Component.processMouseEvent(Component.java:6038)
	at javax.swing.JComponent.processMouseEvent(JComponent.java:3260)
	at java.awt.Component.processEvent(Component.java:5803)
	at java.awt.Container.processEvent(Container.java:2058)
	at java.awt.Component.dispatchEventImpl(Component.java:4410)
	at java.awt.Container.dispatchEventImpl(Container.java:2116)
	at java.awt.Component.dispatchEvent(Component.java:4240)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4322)
	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3986)
	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3916)
	at java.awt.Container.dispatchEventImpl(Container.java:2102)
	at java.awt.Window.dispatchEventImpl(Window.java:2429)
	at java.awt.Component.dispatchEvent(Component.java:4240)
[catch] at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
	at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:104)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)