Error: Cannot reduce the visibility of the inherited method from object

What does this mean?

Let's say have a class WheeledVehicle. It has a method getWheelCount() which is public. Java guarantees that every WheeledVehicle has this method. You can subclass it (car, truck, APC) all you like, but if I have a variable x of type WheeledVehicle, I can always
void foo(WheeledVehicle x) {
    System.out.println("Got " + x.getWheelCount() + " wheels.");
} No matter what subclass x really happens to be. If you subclass WheeledVehicle and override getWheelCount() with a private method, java will not allow it. It breaks the contract.
Ok.
Every class in java extends class java.lang.Object . Object has a number of methods which you ought to make yourself familiar with. You have obviously done something like:
class Bar {
   private Object clone() {

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