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That says your paint method is not overriding a method in the AL class.
Does the AL class have a paint method that you can override?

Did you add the @Override statement to ask the compiler to check your code?

That's strange. There should be calls to the paint() method.
Try adding an @Override statement just before the paint method to see if the compiler thinks that your paint mehtod is an override or...

Add a println statement to the paint method to see if it is being called.
What color will the fillOval() use?