SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length about flutter_slidable HOT 6 CLOSED

               ` return new Slidable(`
                     ` key: new Key(_messages[index].toString()),`
                     ` controller: slidableController,`
                      `direction:Axis.horizontal,`
                      `delegate: _getDelegate(item.id),`
                      `actionExtentRatio: 0.25,`
                      `child: new Column(`
                        `crossAxisAlignment: isReceived`
                            `? CrossAxisAlignment.start`
                            `: CrossAxisAlignment.end,`
                        `mainAxisAlignment: isReceived`
                            `? MainAxisAlignment.start`
                            `: MainAxisAlignment.end,`
                       ` children: <Widget>[`
                          `new Container(`
                            `margin: isReceived ? new EdgeInsets.only(`
                                `left: 10.0, right: MediaQuery`
                                `.of(context)`
                                `.size`
                                `.width / 4, top: 5.0, bottom: 5.0) :`
                            `new EdgeInsets.only(left: MediaQuery`
                                `.of(context)`
                                `.size`
                                `.width / 4, right: 10.0, top: 5.0, bottom: 5.0),`
                           ` padding: new EdgeInsets.only(`
                                `left: 20.0, right: 20.0, top: 10.0, bottom: 10.0),`
                            `decoration: new BoxDecoration(`
                              `color: Colors.grey.withOpacity(0.1),`
                              `borderRadius: BorderRadius.circular(10.0),`
                            `),`
                            `child: new Column(`
                              `crossAxisAlignment: CrossAxisAlignment.start,`
                              `children: <Widget>[`
                                `new Text(isReceived ? senderName : "Siz", style: TextStyle(`
                                    `color: isReceived ? Colors.red : Colors.green),),`
                                `new Text(content, style: TextStyle(color: Colors.white),),`
                               ` SizedBox(height: 6.0,),`
                                `new Text(`
                                  `date.toString().substring(0, 16),`
                                  `style: TextStyle(color: Colors.grey, fontSize: 12.0),`
                                  `textAlign: TextAlign.end,`
                           ```
 ),
                              ],
                            ),
                          ),
                        ],
                      ),

                          `actions: <Widget>[`
                            `new IconSlideAction(`
                          ```
    caption: 'Delete',
                              color: Colors.red,

                          ```

                         ```
 secondaryActions: <Widget>[
                            new IconSlideAction(
                              caption: 'Delete',
                              color: Colors.red,
                              icon: Icons.delete,
                              onTap: () => deleteMessage(),
                            ),
                          ],
                        );

    class MyWidget extends StatelessWidget{
      final GlobalKey<FormState> _formKey = GlobalKey<FormState>(); 
      @override
      Widget build(BuildContext context) {
        // TODO: implement build
        return Scaffold(
          body: Form(
            key: _formKey,
            child: TextFormField(),
          ),
        );
      }
    }

class MyWidget extends StatefulWidget{
      @override
      State<StatefulWidget> createState() {
        // TODO: implement createState
        return _MyWidgetState();
      }
    }
    
    class _MyWidgetState extends State<MyWidget>{
      final GlobalKey<FormState> _formKey = GlobalKey<FormState>(); 
      @override
      Widget build(BuildContext context) {
        // TODO: implement build
        return Scaffold(
          body: Form(
            key: _formKey,
            child: TextFormField(),
          ),
        );
      }
    }