How to resolve expected identifier and ':' expected error in flutter?

Question

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?

Container(
              padding: EdgeInsets.only(top: 35.0, left: 20.0, right: 20.0),
              child:( _futureUser == null)
            ? Column(
                children: <Widget>[...]
)//column
)//Here I have an error //Container

Answer 1

You have to specify the else expression by adding the :
Try this :

Container(
   padding: EdgeInsets.only(top: 35.0, left: 20.0, right: 20.0),
   child:( _futureUser == null)? Column(children: <Widget>[...]):Container()
),