ClassFormatError with Groovy Beta 5 and JDK 1.5 Beta 1

Running the following:
----------------------

class gtest3 {
static main(args)

}

I get the following ClassFormatError:
-------------------------------------

Exception in thread "main" java.lang.ClassFormatError: Invalid index 3 in LocalV
ariableTable in class file gtest3
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:604)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:12
3)
at groovy.lang.GroovyClassLoader.access$100(GroovyClassLoader.java:78)
at groovy.lang.GroovyClassLoader$ClassCollector.onClassNode(GroovyClassL
oader.java:440)
at groovy.lang.GroovyClassLoader$ClassCollector.call(GroovyClassLoader.j
ava:450)
at org.codehaus.groovy.control.CompilationUnit$5.call(CompilationUnit.ja
va:666)
at org.codehaus.groovy.control.CompilationUnit.applyToPrimaryClassNodes(
CompilationUnit.java:922)
at org.codehaus.groovy.control.CompilationUnit.classgen(CompilationUnit.
java:586)
at org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.j
ava:480)
at groovy.lang.GroovyClassLoader.parseClass(GroovyClassLoader.java:228)
at groovy.lang.GroovyClassLoader.parseClass(GroovyClassLoader.java:154)
at groovy.lang.GroovyShell$2.run(GroovyShell.java:207)
at java.security.AccessController.doPrivileged(Native Method)
at groovy.lang.GroovyShell.run(GroovyShell.java:205)
at groovy.lang.GroovyShell.main(GroovyShell.java:92)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:494)
at org.codehaus.classworlds.Launcher.launchStandard(Launcher.java:410)
at org.codehaus.classworlds.Launcher.launch(Launcher.java:344)
at org.codehaus.classworlds.Launcher.main(Launcher.java:474)