alice-teacher Unknown Error has occured

[Laurie Solomon Cohen]

I am just starting to introduce Alice at a new school. We will only have a few sessions with it. I am hoping to introduce it to them, so many will be sparked to work on it/play with it over the summer on their own.
Anyway, upon first launching it, it gave me this Unknown Error Has Occurred. I haven't ever seen this error in the others schools I've used Alice.
 It seems like it maybe a Java error?? Will we have more troubles as we create Alice stories?
Laurie Cohen
====================================
This is the what the full error says:
 
OOPS!! Looks like we have a slight layout problem. Not a big deal, press OK to continue. 
Alice version: 2.4.2 (July 2014)
os.name: Windows 7
os.version: 6.1
os.arch: x86
java.vm.name: Java HotSpot(TM) Client VM
java.vm.version: 20.0-b11
user.dir: C:\Program Files (x86)\Alice2.4\Alice 2.4\Required
 
Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException
 at javax.swing.LayoutComparator.compare(LayoutComparator.java:61)
 at java.util.Arrays.mergeSort(Arrays.java:1293)
 at java.util.Arrays.sort(Arrays.java:1210)
 at java.util.Collections.sort(Collections.java:159)
 at javax.swing.SortingFocusTraversalPolicy.enumerateAndSortCycle(SortingFocusTraversalPolicy.java:119)
 at javax.swing.SortingFocusTraversalPolicy.getFirstComponent(SortingFocusTraversalPolicy.java:434)
 at javax.swing.LayoutFocusTraversalPolicy.getFirstComponent(LayoutFocusTraversalPolicy.java:148)
 at javax.swing.SortingFocusTraversalPolicy.getDefaultComponent(SortingFocusTraversalPolicy.java:511)
 at java.awt.FocusTraversalPolicy.getInitialComponent(FocusTraversalPolicy.java:152)
 at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:340)
 at java.awt.Component.dispatchEventImpl(Component.java:4523)
 at java.awt.Container.dispatchEventImpl(Container.java:2099)
 at java.awt.Window.dispatchEventImpl(Window.java:2478)
 at java.awt.Component.dispatchEvent(Component.java:4481)
 at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:643)
 at java.awt.EventQueue.access$000(EventQueue.java:84)
 at java.awt.EventQueue$1.run(EventQueue.java:602)
 at java.awt.EventQueue$1.run(EventQueue.java:600)
 at java.security.AccessController.doPrivileged(Native Method)
 at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
 at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98)
 at java.awt.EventQueue$2.run(EventQueue.java:616)
 at java.awt.EventQueue$2.run(EventQueue.java:614)
 at java.security.AccessController.doPrivileged(Native Method)
 at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
 at java.awt.EventQueue.dispatchEvent(EventQueue.java:613)
 at java.awt.SequencedEvent.dispatch(SequencedEvent.java:101)
 at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:641)
 at java.awt.EventQueue.access$000(EventQueue.java:84)
 at java.awt.EventQueue$1.run(EventQueue.java:602)
 at java.awt.EventQueue$1.run(EventQueue.java:600)
 at java.security.AccessController.doPrivileged(Native Method)
 at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
 at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98)
 at java.awt.EventQueue$2.run(EventQueue.java:616)
 at java.awt.EventQueue$2.run(EventQueue.java:614)
 at java.security.AccessController.doPrivileged(Native Method)
 at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
 at java.awt.EventQueue.dispatchEvent(EventQueue.java:613)
 at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
 at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
 at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
 at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
 at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
 at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
 
 

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