title: Only static members can accessed in initializes
body: <p>I have issue in set my List variable(_tasks) with a method(readSavedTasks) being called to setup for the values. Here's the code line that have the error.</p>
  <pre><code>Future&lt;List&lt;ListTasks&gt;&gt; readSavedTasks() async {
     List&lt;ListTasks&gt; tasksSaved = await DataStorage().readTasks();
     return Future.value(tasksSaved);
  }
  
  List&lt;ListTasks&gt; _tasks = readSavedTasks();
  </code></pre>
  <p>Can anybody help me on this?</p>