[scala-tools] Re: NoClassDefFoundError with Eclipse Plugin

I upgraded my Eclipse platform to Version: 3.4.2, Build id: M20090211-1700,
but the problem still happens.
Here are more details. I found theese errors in the Error log window of
Eclipse:

Build compiler (scalac) crashed
java.util.NoSuchElementException: None.get
 at scala.None$.get(Option.scala:150)
 at scala.None$.get(Option.scala:148)
 at
scala.tools.eclipse.ScalaPlugin$ProjectImpl$class.nscToLampion(ScalaPlugin.scala:377)
 at scala.tools.eclipse.Driver$Project.nscToLampion(Driver.scala:16)
 at
scala.tools.eclipse.ScalaPlugin$ProjectImpl$class.nscToEclipse(ScalaPlugin.scala:381)
 at scala.tools.eclipse.Driver$Project.nscToEclipse(Driver.scala:16)
 at
scala.tools.eclipse.ScalaPlugin$ProjectImpl$class.charSet(ScalaPlugin.scala:179)
 at scala.tools.eclipse.Driver$Project.charSet(Driver.scala:16)
 at scala.tools.eclipse.BuildCompiler.getSourceFile(BuildCompiler.scala:53)
 at scala.tools.nsc.Global.getSourceFile(Global.scala:217)
 at scala.tools.nsc.Global$Run$$anonfun$compile$1.apply(Global.scala:667)
 at scala.tools.nsc.Global$Run$$anonfun$compile$1.apply(Global.scala:667)
 at scala.List.map(List.scala:812)
 at scala.tools.nsc.Global$Run.compile(Global.scala:667)
 at scala.tools.eclipse.BuildCompiler.build(BuildCompiler.scala:113)
 at
scala.tools.eclipse.ScalaPlugin$ProjectImpl$class.build(ScalaPlugin.scala:406)
 at scala.tools.eclipse.Driver$Project.build(Driver.scala:16)
 at lampion.eclipse.Builder.build(Builder.scala:90)
 at scala.tools.eclipse.Builder.build(Builder.scala:33)
 at
org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:633)
 at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37)
 at
org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:170)
 at
org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:201)
 at
org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:253)
 at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37)
 at
org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:256)
 at
org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:309)
 at
org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:341)
 at
org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:140)
 at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:238)
 at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)

Problems occurred when invoking code from plug-in:
"org.eclipse.core.resources".
java.util.NoSuchElementException: None.get
 at scala.None$.get(Option.scala:150)
 at scala.None$.get(Option.scala:148)
 at
scala.tools.eclipse.ScalaPlugin$ProjectImpl$class.nscToLampion(ScalaPlugin.scala:377)
 at scala.tools.eclipse.Driver$Project.nscToLampion(Driver.scala:16)
 at
scala.tools.eclipse.ScalaPlugin$ProjectImpl$$anonfun$build$2.apply(ScalaPlugin.scala:410)
 at
scala.tools.eclipse.ScalaPlugin$ProjectImpl$$anonfun$build$2.apply(ScalaPlugin.scala:410)
 at scala.Iterator$class.foreach(Iterator.scala:414)
 at
scala.collection.jcl.MutableIterator$Wrapper.foreach(MutableIterator.scala:14)
 at scala.Iterable$class.foreach(Iterable.scala:256)
 at scala.collection.jcl.LinkedHashSet.foreach(LinkedHashSet.scala:18)
 at
scala.tools.eclipse.ScalaPlugin$ProjectImpl$class.build(ScalaPlugin.scala:410)
 at scala.tools.eclipse.Driver$Project.build(Driver.scala:16)


Thanks a lot.

Bye

Franco