Sharing strings to other native applications not working in react native - react-native

Question

I have been following this tutorial, however, when I go to run the application after dropping the code in, it doesn't seem to work. The tutorial seems fairly simple, so I can not understand why it is not working.
The error message I'm getting is:
import React from 'react'
import { View, Text, StyleSheet, Image, Share } from 'react-native'
class ShareLesson extends Component {
constructor(props) {
super(props);
this._shareMessage = this._shareMessage.bind(this);
this._showResult = this._showResult.bind(this);
this.state = { result: ''};
}
_showResult(result) {
this.setState({result});
}
_shareMessage() {
Share.share({
message: 'This is a simple shared message'
}).then(this._showResult);
}
render() {
return (
<View style={styles.container}>
<TouchableHighlight onPress={this._shareMessage}>
<Text style={styles.welcome}>
Share
</Text>
</TouchableHighlight>
<Text>
{JSON.stringify(this.state.result)}
</Text>
<View>);
}
}
Tabs Component
class Tabs extends Component {
_changeTab (i) {
const { changeTab } = this.props
changeTab(i)
}
_renderTabContent (key) {
switch (key) {
case 'today':
return <Home />
case 'share':
return <Share />
case 'savequote':
return <SaveQuote />
case 'moremenu':
return <MoreMenu />
}
}
render () {
const tabs = this.props.tabs.tabs.map((tab, i) => {
return (
<TabBarIOS.Item key={tab.key}
icon={tab.icon}
selectedIcon={tab.selectedIcon}
title={tab.title}
onPress={() => this._changeTab(i)}
selected={this.props.tabs.index === i}>
{this._renderTabContent(tab.key)}
</TabBarIOS.Item>
)
})
return (
<TabBarIOS tintColor='black'>
{tabs}
</TabBarIOS>
)
}
}
export default Tabs