I use sdt 1.0.0.201008150413

When selecting a project and "Scala > Create Scala Interpreter in .." I get following in the console:

Exception in thread "main" java.lang.NoClassDefFoundError: scala/tools/nsc/MainInterpreter
Caused by: java.lang.ClassNotFoundException: scala.tools.nsc.MainInterpreter
	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)

The command line formed by sdt (I can see in debug view when selecting last launch and then -> Properties) is

/System/Library/Frameworks/JavaVM.framework/Versions/1.6.0/Home/bin/java
-Dfile.encoding=UTF-8
-Xbootclasspath/p:/Applications/eclipse-helios-scala/configuration/org.eclipse.osgi/bundles/328/1/.cp/lib/scala-library.jar:/Applications/eclipse-helios-scala/configuration/org.eclipse.osgi/bundles/328/1/.cp/lib/scala-dbc.jar:/Applications/eclipse-helios-scala/configuration/org.eclipse.osgi/bundles/328/1/.cp/lib/scala-swing.jar
-classpath /Applications/eclipse-helios-scala/configuration/org.eclipse.osgi/bundles/328/1/.cp/lib/scala-library.jar:/Applications/eclipse-helios-scala/plugins/org.scala-ide.scala.compiler_2.8.0.final-p0001.jar scala.tools.nsc.MainInterpreter
-Xnojline
-classpath /Applications/eclipse-helios-scala/configuration/org.eclipse.osgi/bundles/328/1/.cp/lib/scala-library.jar:/Applications/eclipse-helios-scala/plugins/org.scala-ide.scala.compiler_2.8.0.final-p0001.jar:/Users/ilya/Documents/ws-scala/te/bin