How to fix 'missing form label' error in Material UI Select using chrome WAVE tool

I am using material UI Select and we are using chrome WAVE tool to fix ADA issues. An error of 'Missing form label' is coming on material UI Select like in the below screenshot. Can anyone help me to solve this issue. Thanks in advance.

wave tool: https://chrome.google.com/webstore/detail/wave-evaluation-tool/jbbplnpkjmmeebjpijfedlgcdilocofh

code:

import React from 'react';
import { makeStyles } from '@material-ui/core/styles';
import InputLabel from '@material-ui/core/InputLabel';
import MenuItem from '@material-ui/core/MenuItem';
import FormHelperText from '@material-ui/core/FormHelperText';
import FormControl from '@material-ui/core/FormControl';
import Select from '@material-ui/core/Select';

const useStyles = makeStyles((theme) => ({
formControl: {
margin: theme.spacing(1),
minWidth: 120,
},
selectEmpty: {
marginTop: theme.spacing(2),
},
}));

export default function SimpleSelect() {
const classes = useStyles();
const [age, setAge] = React.useState('');

 const handleChange = (event) => {
 setAge(event.target.value);
 };

  return (
  <div>
  <FormControl className={classes.formControl}>
    <InputLabel id="demo-simple-select-label">Age</InputLabel>
    <Select
      labelId="demo-simple-select-label"
      id="demo-simple-select"
      value={age}
      onChange={handleChange}
    >
      <MenuItem value={10}>Ten</MenuItem>
      <MenuItem value={20}>Twenty</MenuItem>
      <MenuItem value={30}>Thirty</MenuItem>
    </Select>
  </FormControl>
  </div>
 );
  }

screenshot:

I have found one solution for it. Just add htmlFor="demo-simple-select-placeholder-label" in InputLabel tag to rmove the 'missing form label' error.