My Navbar.js is

import { AppBar, makeStyles, Toolbar, Typography } from "@material-ui/core";

const useStyle = makeStyles({
  header: {
    background: '#111111'
  }
})


const Navbar = () => {
  const classes = useStyle();
  return (
   <AppBar className={classes.header }position="static">
     <Toolbar> 
       <Typography component="h2">Code for interview</Typography>
       <Typography component="h2">All Users</Typography>
       <Typography component="h2">Add 

    User</Typography>
         </Toolbar>
       </AppBar>
      );
    };
    
    export default Navbar;

My App.js is

import Navbar from "./components/Navbar";
import CodeForInterview from "./components/CodeForInterview";
import AllUsers from "./components/AllUsers";
import AddUsers from "./components/AddUsers";
import {BrowserRouter, Route, Routes} from 'react-router-dom';
import { render } from "@testing-library/react";
function App() {
  return (
    <BrowserRouter>
   
    <Navbar/>
    <Routes>
    <Route path ="/" element = {<CodeForInterview/>}/>
    <Route path ="/all" element = {<AllUsers/>}/>
    <Route path ="/add" element = {<AddUsers/>}/>
    </Routes>
    
    </BrowserRouter>
  );
}

export default App;

I am getting the error :

Error: Invalid hook call. Hooks can only be called inside of the body of a function component. This could happen for one of the following reasons:

1. You might have mismatching versions of React and the renderer (such as React DOM)
2. You might be breaking the Rules of Hooks
3. You might have more than one copy of React in the same app