React render an element corectly - reactjs

Question

I have a little problem, I try to build a language learning website using React,
this is my initial homepage, and when i try to search for a word and that word doesn't exist in the database my website it s supposed to say "we can't find the word in our database" but that message it's generated on the top on my slideshow.. like
And i literally don't know what can i do..
my homepage code:
import React from 'react';
import Carousel from 'react-bootstrap/Carousel';
import pozika from '../images/telescop.png';
import '../../src/Ceseseu.css';
import pozika2 from '../images/door.png';
import pozika3 from '../images/threeword.png';
import pozaAbout from '../images/learnkorean.jpg';
import { FontAwesomeIcon } from '#fortawesome/react-fontawesome';
import NavbarFunction from '../pages/NavBarAndSearchSentence';
import { faCheckSquare } from '#fortawesome/free-solid-svg-icons';
function HomePageSlideShow() {
return (
<>
<div className='test '>
<Carousel>
{/* <div className='letsDoIt'> */}
<Carousel.Item interval={1000}>
<img
className='d-block w-100'
width={900}
height={500}
src={pozika}
alt='First slide'
/>
<Carousel.Caption>
<h3></h3>
<p></p>
</Carousel.Caption>
</Carousel.Item>
{/* </div> */}
<Carousel.Item interval={1000}>
<img
className='d-block w-100 '
src={pozika2}
alt='Third slide'
width={100}
height={500}
/>
<Carousel.Caption>
<h3></h3>
<p></p>
</Carousel.Caption>
</Carousel.Item>
<Carousel.Item interval={1000}>
<img
className='d-block w-100'
src={pozika3}
alt='Third slide'
width={900}
height={500}
/>
<Carousel.Caption>
<h3></h3>
<p></p>
</Carousel.Caption>
</Carousel.Item>
</Carousel>
</div>
</>
);
}
function HomePage() {
return (
<>
<HomePageSlideShow />
</>
);
}
export default HomePage;
and my function for searching process it s in another class, same class with my nav bar
import React from 'react';
import SentencesByWord from './SentencesByWord';
import { useState } from 'react';
import { Redirect } from 'react-router-dom';
import { useHistory } from 'react-router-dom';
import 'bootstrap/dist/css/bootstrap.min.css';
import { Navbar, Nav, Form, FormControl, Button } from 'react-bootstrap';
function NavbarFunction() {
const [sentence, setSentence] = useState('');
const [fetchu, setFetchu] = useState('');
const [error, setError] = useState('');
let history = useHistory();
const FetchData = () => {
fetch(`http://localhost:8080/words/showSentences?word=` + sentence)
.then((response) => response.json())
.then(setFetchu)
.then(console.log(fetchu))
.catch(function (error) {
console.log('mergi');
setError("We can't find the word in our database");
});
history.push('/home');
};
const OnChangerr = (e) => {
setSentence(e.target.value);
};
const HandleKeypress = (e) => {
if (e.keyCode === 13) {
FetchData();
}
};
return (
<>
<div className='inlineu'>
<Navbar bg='dark' variant='dark'>
<Navbar.Brand href='Home'>LearningVocab</Navbar.Brand>
<Nav className='mr-auto'>
<Nav.Link href='GiveMeSentences'>
Random Sentences
</Nav.Link>
<Nav.Link href='SendEmail'>
Send us your thoughts
</Nav.Link>
<Nav.Link href='SearchByWord'>Pricing</Nav.Link>
</Nav>
<Form inline>
<FormControl
type='text'
placeholder='Search'
className='mr-sm-2'
onChange={OnChangerr}
onKeyDown={HandleKeypress}
/>
<Button variant='outline-info' onClick={FetchData}>
Search
</Button>
</Form>
</Navbar>
</div>
{fetchu ? (
<div>
<h1> {fetchu.korfirstSentence} </h1>
<h1>{fetchu.kosecondSentence}</h1>
<h1>{fetchu.kothirdSentence}</h1>
<h1>{fetchu.kowordTranslation}</h1>
<h1>{fetchu.kowordId}</h1>
</div>
) : (
// <h1> {fetchu.kosecondSentence} </h1>
<h1 className='someSpace'>{error}</h1>
)}
</>
);
}
export default NavbarFunction;
i used boostrap for css
My react component tree: