Android : How to create a Thread in RubyMotion for Android

Im trying to create a thread in RubyMotion for Android (beta).

I have tried the following code:

class MyRun
  def run
  end
end

r = MyRun.new
t = Thread.new(r)
t.start

The error I get is:

java.lang.NoSuchMethodError: no method with name='< init>' signature='(Ljava/lang/Runnable;)V' in class Lcom/rubymotion/Thread;

It is automatically finding the right signature (Runnable) but Im not sure why its confused. http://developer.android.com/reference/java/lang/Thread.html