React-native unrecognized font family error

I wanted to use a custom font in my react-native project, but I got an error on ios simulatorHow can I solve it
I tried every way but I couldn't find a solution.

Unrecognized Font Family: sfproregular

Error:Error Screenshot

Project Structure:Project structure screenshot

react-native.config.js

module.exports = {    project: {      ios: {},      android: {}, // grouped into "project"    },    assets: ["./assets/fonts/"], // stays the same  };

versions

"react": "16.13.1","react-native": "0.63.2","react-native-gesture-handler": "^1.7.0","react-native-phone-input": "^0.2.4","react-navigation": "^4.4.0"

I wanted to use the font in "Welcome.js"

Welcome.js

import React from 'react';import {  SafeAreaView,  StyleSheet,  ScrollView,  View,  Text,  Image,  StatusBar,  TouchableOpacity,  Button,  ImageBackground,} from 'react-native';import Logo from '../components/WelcomeLogo';import arkaplan from '../assets/images/arkaplan.png';export default class Welcome extends React.Component {  render() {  return (<><ImageBackground source={arkaplan}  style={styles.constrain} ><StatusBar barStyle="light-content"/><Logo /><Text style={styles.welcome} >Welcome!</Text></View></>  )  }};const styles = StyleSheet.create({  constrain: {    flex: 1,     alignItems:'center',     justifyContent:'center',  welcome: {    fontSize: 50,    color: 'white',    fontFamily: 'sfprogregular',    marginTop: 20,    marginBottom: 5,  },});