React Navigation Error this.props.navigation.navigat - react-native

Question

I have two screens and I want to on click to move new screen using react navigation. but I got an error
this.props.navigation.navigate
here is my code. anyone knows what is an issue. I follow every step.
import React, {Component} from 'react';
import { AppRegistry, View, Text,StyleSheet, TextInput, Image, ScrollView, Button, TouchableOpacity} from 'react-native';
import { createStackNavigator, createAppContainer } from 'react-navigation';
import SignUp from './SignUp';
class Login extends React.Component{
constructor(props){
super(props);
this.state = { text: 'Useless Placeholder' };
}
render(){
const {navigate} = this.props.navigation;
return(
<View>
<ScrollView showsVerticalScrollIndicator={false}>
<View style={styles.button}>
<TouchableOpacity>
<Text style={styles.buttonText}>SIGN IN</Text>
</TouchableOpacity>
</View>
<View style={styles.createAccount}>
<Text style={styles.createText}
onPress={() => this.props.navigation.navigate("Home")}
>Create new account</Text>
</View>
</View>
</ScrollView>
</View>
);
}
}
module.exports = Login;
const MainNavigator = createStackNavigator({
Home: {screen: SignUp}
});
export default createAppContainer(MainNavigator);

Answer 1

Your Login screen is not a part of your stack.
const MainNavigator = createStackNavigator({
Home: {screen: SignUp}
});
Just make a separate component of Login screen add it on the top of your stack then you are able to navigate.
like this
const MainNavigator = createStackNavigator({
Login:{screen:Login}
Home: {screen: SignUp}
});
Login.js
import React, {Component} from 'react';
import { AppRegistry, View, Text,StyleSheet, TextInput, Image, ScrollView, Button, TouchableOpacity} from 'react-native';
export default class Login extends React.Component{
constructor(props){
super(props);
this.state = { text: 'Useless Placeholder' };
}
render(){
const {navigate} = this.props.navigation;
return(
<View>
<ScrollView showsVerticalScrollIndicator={false}>
<View style={styles.button}>
<TouchableOpacity>
<Text style={styles.buttonText}>SIGN IN</Text>
</TouchableOpacity>
</View>
<View style={styles.createAccount}>
<Text style={styles.createText}
onPress={() => this.props.navigation.navigate("Home")}
>Create new account</Text>
</View>
</View>
</ScrollView>
</View>
);
}
MainNavigator.js
import React, {Component} from 'react';
import { AppRegistry, View, Text,StyleSheet, TextInput, Image, ScrollView, Button, TouchableOpacity} from 'react-native';
import { createStackNavigator, createAppContainer } from 'react-navigation';
import SignUp from './SignUp';
import Login from './Login'
const MainNavigator = createStackNavigator({
Login: {screen:Login},
Home: {screen: SignUp}
});
export default createAppContainer(MainNavigator);

Answer 2

you haven't added your Login screen in stack
here like this
const MainNavigator = createStackNavigator({
Login : {screen: Login},
Home: {screen: SignUp}
});