Static variable

I got 2 classes one it’s a superclass and contains a static variable. The other it’s a subclass
(this is just an experimentation…)

While compiled, I got a msg error in subclass saying: the class or interface OOtest could NOT be loaded. I can’t calling a static variable of the mother class.

ex:
class OOSubtest extends OOtest {

public function OOSubtest() {
    trace("test: " +OOtest.test);
}

}

class OOtest {
public static var test = “Aquarium”;
}