title: Why does my project result in the "More than one component matched on this element." error?
body: <p>I have the following project in a StackBlitz:</p>
  
  <p><a href="https://stackblitz.com/github/nickhodges/PhillyCCTodoApp/tree/Step20" rel="noreferrer">https://stackblitz.com/github/nickhodges/PhillyCCTodoApp/tree/Step20</a></p>
  
  <p>I get this error:</p>
  
  <pre><code>Template parse errors:
  More than one component matched on this element.
  Make sure that only one component's selector can match a given element.
  </code></pre>
  
  <p>I have googled my little heart out, but can't seem to find a solution.</p>
  
  <p>What does this error mean and how do I fix it?</p>
  
  <p>I should note that the error only occurs in StackBlitz and not on my local machine.</p>