Invalid use of state

Counter.js

const App = () => {
  const [count, setCount] = useState(0);

  const handleClick = () => {
    setCount(count + 1);
  };

  return (
    <div>
      <Header />
      <input type="button" onClick={handleClick} value="Increment" />
      <Content />
    </div>
  );
};