Unknown error inside the compiler

[PDXIII]

Sorry to say that, but it's not working on my system (Mac OS X 10.8.3).
Installed Processing 2.0b9 and jython 2.5.3 and I am receiving this error:

java.lang.ClassNotFoundException: org.eclipse.jdt.core.compiler.batch.BatchCompiler
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 java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:249)
at processing.mode.java.Compiler.compile(Compiler.java:135)
at com.martinleopold.mode.python.PythonBuild.build(Unknown Source)
at processing.mode.java.JavaBuild.build(JavaBuild.java:123)
at com.martinleopold.mode.python.PythonMode.handleRun(Unknown Source)
at processing.mode.java.JavaEditor$19.run(JavaEditor.java:472)
at java.lang.Thread.run(Thread.java:680)
processing.app.SketchException: Unknown error inside the compiler.
at processing.mode.java.Compiler.compile(Compiler.java:145)
at com.martinleopold.mode.python.PythonBuild.build(Unknown Source)
at processing.mode.java.JavaBuild.build(JavaBuild.java:123)
at com.martinleopold.mode.python.PythonMode.handleRun(Unknown Source)
at processing.mode.java.JavaEditor$19.run(JavaEditor.java:472)
at java.lang.Thread.run(Thread.java:680)