djacent JSX elements must be wrapped in an enclosing tag. Did you want a JSX fragment <>...</>? (51:6) code example

Example: Adjacent JSX elements must be wrapped in an enclosing tag. Did you want a JSX fragment <>...?

render() {
  return (
    <React.Fragment>
      <ChildA />
      <ChildB />
      <ChildC />
    </React.Fragment>
  );
}