Firebase warning when entering chat message

Question

I am running an react-native chat app example from Even Bacon. I can enter my name successfully. But when I enter a chat message, then I have a warning about firebase, the chat message was not taken:

Here is the Chat.js:

import React, { Component} from 'react';
import {View, StyleSheet } from 'react-native';
import { GiftedChat } from 'react-native-gifted-chat';
import Fire from '../Fire';

class Chat extends React.Component {
    static navigationOptions = ({ navigation}) => ({
        title: (navigation.state.params || {}).name || 'Chat!',
    });

    state = {
        messages: [],
    };

    componentDidMount() {
        Fire.shared.on(message =>
              this.setState(previousState => ({
                messages: GiftedChat.append(previousState.messages, message),
              }))
        );
    }

    componentWillUnmount() {
      Fire.shared.off();
    }

    get user() {
      // return our name and our UID for GiftedChat to parse
      return {
          name: this.props.navigation.state.params.name,
          _id: Fire.shared.uid,
      };
    }

    render() {
        return (
            <GiftedChat 
              messages={this.state.messages}
              onSend={Fire.shared.send}
              user={this.user}
            /> 
        );
    }
}

const styles = StyleSheet.create({});



export default Chat;

Answer 1

Make sure you have set up your database rules like this

{
  "rules": {
    ".read": true,
    ".write": true
  }
}