strange error during wolfgang workshop break out

strange error during wolfgang workshop break out for this file.

the rest works

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
   at org.colos.ejs.osejs.Metadata.(Unknown Source)
   at org.colos.ejs.osejs.Generate.generate(Unknown Source)
   at org.colos.ejs.osejs.Osejs.firstCompile(Unknown Source)
   at org.colos.ejs.osejs.Osejs.runSimulation(Unknown Source)
   at org.colos.ejs.osejs.Osejs.access27(Unknown Source)
   at org.colos.ejs.osejs.Osejs126.run(Unknown Source)
   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)
Exception in thread \"AWT-EventQueue-0\" java.lang.NullPointerException
   at org.colos.ejs.osejs.Metadata.(Unknown Source)
   at org.colos.ejs.osejs.Generate.generate(Unknown Source)
   at org.colos.ejs.osejs.Osejs.firstCompile(Unknown Source)
   at org.colos.ejs.osejs.Osejs.runSimulation(Unknown Source)
   at org.colos.ejs.osejs.Osejs.access27(Unknown Source)
   at org.colos.ejs.osejs.Osejs $12$ 6.run(Unknown Source)
   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)
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
   at org.colos.ejs.osejs.Metadata.(Unknown Source)
   at org.colos.ejs.osejs.Generate.generate(Unknown Source)
   at org.colos.ejs.osejs.Osejs.firstCompile(Unknown Source)
   at org.colos.ejs.osejs.Osejs.runSimulation(Unknown Source)
   at org.colos.ejs.osejs.Osejs.access27(Unknown Source)
   at org.colos.ejs.osejs.Osejs12$6.run(Unknown Source)
   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)

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