title: Can't figure out what's causing the error here - React Native ToDo List App
body: <p>my react native ToDo list app is crashing whenever I try to type in and add an item to the list with the + button. Attached are screenshots of the android emulator.</p>
  
  <p><a href="https://i.stack.imgur.com/XRxN5.png" rel="nofollow noreferrer">Here's the initial look</a></p>
  
  <p><a href="https://i.stack.imgur.com/aDb61.png" rel="nofollow noreferrer">The Error Message</a></p>
  
  <p>I don't want to post a wall of text so here's the github link to the project: 
  <a href="https://github.com/Accurac/todoApp2018/tree/master/todoApp" rel="nofollow noreferrer">https://github.com/Accurac/todoApp2018/tree/master/todoApp</a>
  The only files edited were App.js, app/components/Main.js and app/components/Note.js</p>
  
  <p>I feel like the main cause is this line:</p>
  
  <pre><code>let notes = this.state.noteArray.map((val, key) =&gt; {
        return &lt;Note key={key} keyval={key} val={val}
        deleteMethod={() =&gt; this.deleteNote(key)} /&gt;
      });
  </code></pre>
  
  <p>Thanks for any help, I just have no idea what the issue is :/</p>