Error: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: undefined. You likely forgot to export your component from the file it's defined in, or you might have mixed up default and named imports.

Check the render method of Register.

React Native böyle bir hata alıyorum yardımcı olabilirmisiniz

Login Sayfası:

import React, { useState } from 'react';
import {
StyleSheet,
Text,
View,
ImageBackground,
TouchableOpacity,
KeyboardAvoidingView,
ScrollView,
} from 'react-native';

// Expo Linear Gradient
import { LinearGradient } from 'expo-linear-gradient';

// React Navigation
import { createStackNavigator } from '@react-navigation/stack';

// Components
import Input from '../../components/Auth/Input';

// Icons
import * as Icon from '../../components/icons';

// Views
import Register from './Register';

function Login({ navigation }) {
const [passwordShow, setPasswordShow] = useState(true);

return (
    <KeyboardAvoidingView behavior="padding" style={styles.container}>
        <ScrollView contentContainerStyle={{ flex: 1 }} bounces={false}>
            <ImageBackground
                source={require('../../../assets/posters.png')}
                style={{ flex: 1 }}
            >
                <View style={styles.header}>
                    <Icon.Logo width={60} height={60} />
                    <TouchableOpacity
                        onPress={() => navigation.navigate('Register')}
                    >
                        <Text style={{ color: 'white' }}>ÜYE OL ➔</Text>
                    </TouchableOpacity>
                </View>
                <LinearGradient
                    colors={['transparent', 'rgba(39,40,44,1)']}
                    style={[
                        StyleSheet.absoluteFillObject,
                        { borderRadius: 1 },
                    ]}
                />
            </ImageBackground>
            <View style={styles.form}>
                <Text style={styles.formTitle}>Giriş Yap</Text>
                <View style={styles.inputContainer}>
                    <Input placeholder="E-Posta Adresi" />
                    <Icon.Mail
                        width={24}
                        height={24}
                        fill={'#DB2424'}
                        style={{ margin: 10 }}
                    />
                </View>
                <View style={styles.inputContainer}>
                    <Input
                        placeholder="Şifre"
                        secureTextEntry={passwordShow}
                    />
                    <TouchableOpacity
                        onPress={() => setPasswordShow(!passwordShow)}
                    >
                        {passwordShow == true ? (
                            <Icon.ClosedEye
                                width={24}
                                height={24}
                                stroke={'#DB2424'}
                                style={{ margin: 10 }}
                            />
                        ) : (
                            <Icon.OpenEye
                                width={24}
                                height={24}
                                stroke={'#DB2424'}
                                style={{ margin: 10 }}
                            />
                        )}
                    </TouchableOpacity>
                </View>
                <TouchableOpacity style={styles.forgotPasswordButton}>
                    <Text style={{ color: '#a3a3a3' }}>
                        Şifremi Unuttum?
                    </Text>
                </TouchableOpacity>
                <TouchableOpacity style={styles.submitButton}>
                    <Text style={styles.submitButtonText}>Giriş Yap</Text>
                </TouchableOpacity>
            </View>
        </ScrollView>
    </KeyboardAvoidingView>
);
}

const Stack = createStackNavigator();

export default function LoginStack() {
return (
    <Stack.Navigator
        screenOptions={{
            headerShown: false,
        }}
        initialRouteName="Login"
    >
        <Stack.Screen name="Login" component={Login} />
        <Stack.Screen name="Register" component={Register} />
    </Stack.Navigator>
);
}

Register Sayfası:

import React, { useState } from 'react';
import {
StyleSheet,
Text,
View,
ImageBackground,
TouchableOpacity,
KeyboardAvoidingView,
ScrollView,
} from 'react-native';

// Expo Linear Gradient
import { LinearGradient } from 'expo-linear-gradient';

// Components
import Input from '../../components/Auth/Input';

// Icons
import * as Icon from '../../components/icons';

export default function Register({ navigation }) {
const [passwordShow, setPasswordShow] = useState(true);

return (
    <KeyboardAvoidingView behavior="padding" style={styles.container}>
        <ScrollView contentContainerStyle={{ flex: 1 }} bounces={false}>
            <ImageBackground
                source={require('../../../assets/posters.png')}
                style={{ flex: 1 }}
            >
                <View style={styles.header}>
                    <Icon.Logo width={60} height={60} />
                    <TouchableOpacity
                        onPress={() => navigation.goBack()}
                    >
                        <Text style={{ color: 'white' }}>GİRİŞ YAP ➔</Text>
                    </TouchableOpacity>
                </View>
                <LinearGradient
                    colors={['transparent', 'rgba(39,40,44,1)']}
                    style={[
                        StyleSheet.absoluteFillObject,
                        { borderRadius: 1 },
                    ]}
                />
            </ImageBackground>
            <View style={styles.form}>
                <Text style={styles.formTitle}>Kayıt Ol</Text>
                <View style={styles.inputContainer}>
                    <Input placeholder="Ad Soyadı" />
                    <Icon.Profile
                        width={24}
                        height={24}
                        stroke={'#DB2424'}
                        style={{ margin: 10 }}
                    />
                </View>
                <View style={styles.inputContainer}>
                    <Input placeholder="E-Posta Adresi" />
                    <Icon.Mail
                        width={24}
                        height={24}
                        fill={'#DB2424'}
                        style={{ margin: 10 }}
                    />
                </View>
                <View style={styles.inputContainer}>
                    <Input
                        placeholder="Şifre"
                        secureTextEntry={passwordShow}
                    />
                    <TouchableOpacity
                        onPress={() => setPasswordShow(!passwordShow)}
                    >
                        {passwordShow == true ? (
                            <Icon.ClosedEye
                                width={24}
                                height={24}
                                stroke={'#DB2424'}
                                style={{ margin: 10 }}
                            />
                        ) : (
                            <Icon.OpenEye
                                width={24}
                                height={24}
                                stroke={'#DB2424'}
                                style={{ margin: 10 }}
                            />
                        )}
                    </TouchableOpacity>
                </View>
                <TouchableOpacity style={styles.submitButton}>
                    <Text style={styles.submitButtonText}>Kayıt Ol</Text>
                </TouchableOpacity>
            </View>
        </ScrollView>
    </KeyboardAvoidingView>
);
}