Error with react native

everything worked fine until you try to implement

react-native-router-flux'

use the command to install it as follows:

npm i react-native-router-flux

and my routes file stayed in such a way:

import React, { Component } from 'react';
import { Router, Stack, Scene } from 'react-native-router-flux';
import Login from './pages/Login';
import Sigup from './pages/Signup';

export default class Routes extends Component<{}>{

    render(){
        return(
            <Router>
                <Stack key='root'>
                    <Scene key='login' component={Login} title='Login'/>
                    <Scene key='registrer' component={Sigup} title='Registrer'/>                    
                </Stack>
            </Router>
        )
    }
}

sends me the following error: