Class MainGenericRunner not found running scala script

I'm trying to run a scala script using the plugin v0.4.1453 and Scala 2.9.1 final.

This is the result:

/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home/bin/java -Denv.classpath="%CLASSPATH%" -Denv.emacs="%EMACS%" -Didea.launcher.port=7533 -Didea.launcher.bin.path=/Applications/IntelliJ IDEA 10.app/bin -Dfile.encoding=UTF-8 -classpath /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home/lib/deploy.jar:/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home/lib/dt.jar:/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home/lib/javaws.jar:/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home/lib/jce.jar:/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home/lib/jconsole.jar:/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home/lib/management-agent.jar:/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home/lib/plugin.jar:/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home/lib/sa-jdi.jar:/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home/../Classes/alt-rt.jar:/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home/../Classes/alt-string.jar:/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home/../Classes/charsets.jar:/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home/../Classes/classes.jar:/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home/../Classes/jsse.jar:/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home/../Classes/ui.jar:/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home/lib/ext/apple_provider.jar:/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home/lib/ext/dnsns.jar:/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home/lib/ext/localedata.jar:/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home/lib/ext/sunjce_provider.jar:/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home/lib/ext/sunpkcs11.jar:/Users/ryan/work/idea/mltools/out/test/zips:/Users/ryan/work/idea/mltools/out/production/zips:/Users/ryan/work/vendor/jts-1.12/lib/jts-1.12.jar:/Users/ryan/work/vendor/scala-2.9.1.final/lib/scala-library.jar:/Users/ryan/work/vendor/scala-2.9.1.final/lib/scala-swing.jar:/Users/ryan/work/vendor/scala-2.9.1.final/lib/scala-dbc.jar:/Applications/IntelliJ IDEA 10.app/lib/idea_rt.jar com.intellij.rt.execution.application.AppMain scala.tools.nsc.MainGenericRunner -nocompdaemon -classpath  /Users/ryan/work/idea/zips/src/zips.scala
Exception in thread "main" java.lang.ClassNotFoundException: scala.tools.nsc.MainGenericRunner
     at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
     at java.security.AccessController.doPrivileged(Native Method)
     at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
     at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
     at java.lang.Class.forName0(Native Method)
     at java.lang.Class.forName(Class.java:169)
     at com.intellij.rt.execution.application.AppMain.main(AppMain.java:113)

Process finished with exit code 1