index.js:1375 Warning: Functions are not valid as a React child. This may happen if you return a Component instead of <Component /> from render. Or maybe you meant to call this function rather than return it. in A (at App.js:9) in div (at App.js:8

index.js:1375 Warning: Functions are not valid as a React child. This may happen if you return a Component instead of <Component /> from render. Or maybe you meant to call this function rather than return it.

    in A (at App.js:9)

    in div (at App.js:8)

    in App (at src/index.js:5)

报错了