When I validate, I get green checkmarks for all but the last two, where it says "The Color class's getDescription method must return the value of the variable description." and "The Color class's setDescription method must set the value of the variable description.". When I run the file, it correctly prints "Red" in the output, and there's no way it would be able to do that from my code if it weren't successfully using setDescription and getDescription the way it asks for. Here is what I have for this: 
public class Circle {
    private Color color;

    public static void main(String[] args) {
        Circle circle = new Circle();
        circle.color.setDescription("Red");
        System.out.println(circle.color.getDescription());
    }

    public Circle() {
        this.color = new Color();
    }

    public class Color {
        String description;

        public String getDescription() {
            return this.description;
        }

        public void setDescription(String description) {
            this.description = description;
        }
    }
}
But because it executes correctly, I'm thinking the problem is actually something else than what it says... One of the edits I made may have been both unnecessary and irrelevant, but enough to make the validation find something it isn't expecting? I dunno, let me know if you can find what the problem is.