title: Flutter type '_InternalLinkedHashMap<String, dynamic>' is not a subtype of type 'List<dynamic>'
body: <p>I'm a Flutter language learner, new to this world,</p>
  <p><img src="https://i.stack.imgur.com/LybBB.png" alt="Code Example" />
  <a href="https://i.stack.imgur.com/fRj8u.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/fRj8u.png" alt="2º Error" /></a>
  I have a json like:</p>
  <pre><code>{
    &quot;USDBRL&quot;:
    {
      &quot;id&quot;: &quot;...&quot;,
      &quot;name&quot;: &quot;...&quot;,...
    }
  }
  </code></pre>
  <p>My Dolar Model:</p>
  <pre><code>class Dolar {
    String param1;
    String param2;
  
    // Constructor
    Dolar({
      required this.param1,
      required this.param2,
    });
  
    factory Dolar.fromJson(Map&lt;String, dynamic&gt; json) {
      return Dolar(
        param1: json['param1'],
        param2: json['param2'],
      );
    }
  }
  </code></pre>
  <p>I need to grab all &quot;USDBRL&quot; fields, but when I run the app I get &quot;flutter: type '_InternalLinkedHashMap&lt;String, dynamic&gt;' is not a subtype of type 'List&lt;dynamic&gt;'
  &quot;.</p>
  <p>I've tried searching for resolutions on the internet, but none of the alternatives I've tried have worked.</p>