title: No file or variants found for asset: assets/credentials.json error when trying to load in JSON credentials
body: <p>I am trying to pass in some json credentials to my app but get the below error: </p>
  
  <pre><code>Error detected in pubspec.yaml:
  No file or variants found for asset: assets/credentials.json.
  </code></pre>
  
  <p>Any ideas? In there are credentials in the credentials.json file, so I am unsure why that error is being thrown. </p>