title: How to resovle expected identifier and ':' expected error in flutter?
body: <p>I have a surprising error from nowhere and I don't know how to solve it.It needs an identifier and ':'.
  How can I solve it?</p>
  
  <pre><code>Container(
                padding: EdgeInsets.only(top: 35.0, left: 20.0, right: 20.0),
                child:( _futureUser == null)
              ? Column(
                  children: &lt;Widget&gt;[...]
  )//column
  )//Here I have an error //Container
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/0lDJT.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/0lDJT.png" alt="enter image description here"></a></p>