ClassNotFoundException

Hello.
I am trying to create project according to Getting started guide but I got some problems.

When I try to run project I am getting error:

/usr/lib/jvm/java-6-sun/bin/java -Didea.launcher.port=7534 -Didea.launcher.bin.path=/home/smix/Software/idea-IC-95.66/bin -Dfile.encoding=UTF-8 -classpath /usr/lib/jvm/java-6-sun-1.6.0.20/jre/lib/charsets.jar:/usr/lib/jvm/java-6-sun-1.6.0.20/jre/lib/alt-rt.jar:/usr/lib/jvm/java-6-sun-1.6.0.20/jre/lib/javaws.jar:/usr/lib/jvm/java-6-sun-1.6.0.20/jre/lib/rt.jar:/usr/lib/jvm/java-6-sun-1.6.0.20/jre/lib/management-agent.jar:/usr/lib/jvm/java-6-sun-1.6.0.20/jre/lib/deploy.jar:/usr/lib/jvm/java-6-sun-1.6.0.20/jre/lib/jce.jar:/usr/lib/jvm/java-6-sun-1.6.0.20/jre/lib/resources.jar:/usr/lib/jvm/java-6-sun-1.6.0.20/jre/lib/jsse.jar:/usr/lib/jvm/java-6-sun-1.6.0.20/jre/lib/plugin.jar:/usr/lib/jvm/java-6-sun-1.6.0.20/jre/lib/ext/sunpkcs11.jar:/usr/lib/jvm/java-6-sun-1.6.0.20/jre/lib/ext/sunjce_provider.jar:/usr/lib/jvm/java-6-sun-1.6.0.20/jre/lib/ext/dnsns.jar:/usr/lib/jvm/java-6-sun-1.6.0.20/jre/lib/ext/localedata.jar:/home/smix/IdeaProjects/untitled/out/production/untitled:/home/smix/IdeaProjects/untitled/lib/scala-compiler.jar:/home/smix/IdeaProjects/untitled/lib/scala-library.jar:/home/smix/Software/idea-IC-95.66/lib/idea_rt.jar com.intellij.rt.execution.application.AppMain HelloWorld
Exception in thread "main" java.lang.ClassNotFoundException: HelloWorld
     at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
     at java.security.AccessController.doPrivileged(Native Method)
     at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
     at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
     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:107)

Process finished with exit code 1

Idea 9.0.2, latest scala plugin