Exception from Scala Eclipse plugin during build

Hello NG,

during the build of one of my scala projects the scala eclipse plugin
logs an exception and abort the build.
Here is some background information:
- The project contains 2 scala source directories and 1 java source directory
- I installed the eclipse scala plugin 2.7.3-final
- the .project file looks like this

<?xml version="1.0" encoding="UTF-8"?>

test

ch.epfl.lamp.sdt.core.scalabuilder

ch.epfl.lamp.sdt.core.scalanature
org.eclipse.jdt.core.javanature

- the .classpath looks like this

<?xml version="1.0" encoding="UTF-8"?>

and the project defines in .setting/org.eclipse.jdt.core.prefs
#Tue Mar 31 12:48:18 CEST 2009
eclipse.preferences.version=1
org.eclipse.jdt.core.builder.cleanOutputFolder=ignore
org.eclipse.jdt.core.builder.duplicateResourceTask=warning
org.eclipse.jdt.core.builder.invalidClasspath=abort
org.eclipse.jdt.core.builder.recreateModifiedClassFileInOutputFolder=ignore
org.eclipse.jdt.core.builder.resourceCopyExclusionFilter=*.scala
org.eclipse.jdt.core.circularClasspath=error
org.eclipse.jdt.core.classpath.exclusionPatterns=enabled
org.eclipse.jdt.core.classpath.multipleOutputLocations=enabled
org.eclipse.jdt.core.compiler.maxProblemPerUnit=100
org.eclipse.jdt.core.incompatibleJDKLevel=ignore
org.eclipse.jdt.core.incompleteClasspath=error

Here is the exception stack trace I found in the log:

scala.MatchError: 11
at scala.tools.nsc.backend.jvm.GenJVM$BytecodeGenerator.emitElement$1(GenJVM.scala:337)
at scala.tools.nsc.backend.jvm.GenJVM$BytecodeGenerator$$anonfun$scala$tools$nsc$backend$jvm$GenJVM$BytecodeGenerator$$emitAttributes$2$$anonfun$apply$1.apply(GenJVM.scala:399)
at scala.tools.nsc.backend.jvm.GenJVM$BytecodeGenerator$$anonfun$scala$tools$nsc$backend$jvm$GenJVM$BytecodeGenerator$$emitAttributes$2$$anonfun$apply$1.apply(GenJVM.scala:397)
at scala.List.foreach(List.scala:834)
at scala.tools.nsc.backend.jvm.GenJVM$BytecodeGenerator$$anonfun$scala$tools$nsc$backend$jvm$GenJVM$BytecodeGenerator$$emitAttributes$2.apply(GenJVM.scala:397)
at scala.tools.nsc.backend.jvm.GenJVM$BytecodeGenerator$$anonfun$scala$tools$nsc$backend$jvm$GenJVM$BytecodeGenerator$$emitAttributes$2.apply(GenJVM.scala:385)
at scala.List.foreach(List.scala:834)
at scala.tools.nsc.backend.jvm.GenJVM$BytecodeGenerator.scala$tools$nsc$backend$jvm$GenJVM$BytecodeGenerator$$emitAttributes(GenJVM.scala:385)
at scala.tools.nsc.backend.jvm.GenJVM$BytecodeGenerator.addAnnotations(GenJVM.scala:432)
at scala.tools.nsc.backend.jvm.GenJVM$BytecodeGenerator.genClass(GenJVM.scala:219)
at scala.tools.nsc.backend.jvm.GenJVM$JvmPhase$$anonfun$run$2.apply(GenJVM.scala:55)
at scala.tools.nsc.backend.jvm.GenJVM$JvmPhase$$anonfun$run$2.apply(GenJVM.scala:55)
at scala.Iterator$class.foreach(Iterator.scala:414)
at scala.collection.Map$$anon$6.foreach(Map.scala:123)
at scala.tools.nsc.backend.jvm.GenJVM$JvmPhase.run(GenJVM.scala:55)
at scala.tools.nsc.Global$Run.compileSources(Global.scala:574)
at scala.tools.nsc.Global$Run.compile(Global.scala:667)
at scala.tools.eclipse.BuildCompiler.build(BuildCompiler.scala:114)
at scala.tools.eclipse.ScalaPlugin$ProjectImpl$class.build(ScalaPlugin.scala:405)
at scala.tools.eclipse.Driver$Project.build(Driver.scala:16)
at lampion.eclipse.Builder.build(Builder.scala:87)
at scala.tools.eclipse.Builder.build(Builder.scala:32)
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)

Can anyone help me?
The build of the project worked for a few days but now I can not build
the entire project without the occurring of the exception mentioned
above.

Thanks in advance

Cheers,
Thomas