Game - House of Mirrors - run error (xubuntu 11.10)

java.lang.NoClassDefFoundError: scala/swing/MainFrame
	at java.lang.Class.getDeclaredMethods0(Native Method)
	at java.lang.Class.privateGetDeclaredMethods(Class.java:2444)
	at java.lang.Class.getMethod0(Class.java:2687)
	at java.lang.Class.getMethod(Class.java:1620)
	at scala.tools.nsc.util.ScalaClassLoader$class.run(ScalaClassLoader.scala:74)
	at scala.tools.nsc.util.ScalaClassLoader$URLClassLoader.run(ScalaClassLoader.scala:101)
	at scala.tools.nsc.ObjectRunner$.run(ObjectRunner.scala:33)
	at scala.tools.nsc.ObjectRunner$.runAndCatch(ObjectRunner.scala:40)
	at scala.tools.nsc.MainGenericRunner.runTarget$1(MainGenericRunner.scala:56)
	at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:80)
	at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:89)
	at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)
Caused by: java.lang.ClassNotFoundException: scala.swing.MainFrame
	at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
	at scala.tools.nsc.util.ScalaClassLoader$URLClassLoader.scala$tools$nsc$util$ScalaClassLoader$$super$findClass(ScalaClassLoader.scala:88)
	at scala.tools.nsc.util.ScalaClassLoader$class.findClass(ScalaClassLoader.scala:44)
	at scala.tools.nsc.util.ScalaClassLoader$URLClassLoader.findClass(ScalaClassLoader.scala:88)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
	at scala.tools.nsc.util.ScalaClassLoader$URLClassLoader.scala$tools$nsc$util$ScalaClassLoader$$super$loadClass(ScalaClassLoader.scala:88)
	at scala.tools.nsc.util.ScalaClassLoader$class.loadClass(ScalaClassLoader.scala:50)
	at scala.tools.nsc.util.ScalaClassLoader$URLClassLoader.loadClass(ScalaClassLoader.scala:88)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
	... 12 more