Pls send help. I having problems with following code:

Human h = WildOrangutan
.getInstance();
Ass ass = h.getAss();

Toilet toilet = new Toilet();
ass.attachTo(toilet);

while (ass.hasOutput()) {
ass.output();
h.readDevrant();
}

ass.detach(toilet);

// This throws
// OutOfToiletPaperException
ass.clean();