Can't add mongodart in a flutter file which contains a StatefulWidget

454 views android

I'm certainly the first to ask this question because I found just nothing on the internet about this issue. When I try to import mongodart in the main file of my flutter application, I got this error in my IDE (VsCode) and also when I try to run the project with flutter run:

The name 'State' is defined in the libraries 'framework.dart' and 'mongo_dart.dart'.


Compiler message: lib/main.dart:37:32: Error: Expected 0 type arguments. class _MyHomePageState extends State { ^ lib/main.dart:34:20: Error: The return type of the method 'MyHomePage::createState' is

lib1::_MyHomePageState, which does not match the return type of the overridden method (#lib2::State<#lib2::StatefulWidget>). Change to a

subtype of #lib2::State<#lib2::StatefulWidget>. _MyHomePageState createState() => new _MyHomePageState(); ^ file:///home/quentin/flutter/packages/flutter/lib/src/widgets/framework.dart:1: Error: This is the overridden method ('createState'). lib/main.dart:41:5: Error: Method not found: 'setState'. setState(() { ^^^^^^^^ lib/main.dart:41:5: Error: The method 'setState' isn't defined for the class '#lib1::_MyHomePageState'. Try correcting the name to the name of an existing method, or defining a method named 'setState'. setState(() { ^ lib/main.dart:63:25: Error: Getter not found: 'widget'. title: new Text(widget.title), ^^^^^^ lib/main.dart:63:25: Error: The getter 'widget' isn't defined for the class '#lib1::_MyHomePageState'. Try correcting the name to the name of an existing getter, or defining a getter or field named 'widget'. title: new Text(widget.title),

Note: The StatefulWidget is the one from the sample app.

I'm sure this problem is caused by mongodart because when I remove:

import 'package:mongo_dart/mongo_dart.dart';

any form of error disappear. Here's the code that causes the problem.

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1 Answer


Yes, there is class inside the mongo package named "State" which causes the conflict, you can use an alias for that package, like this.

import 'package:mongo_dart/mongo_dart.dart' as mongo;

And if you want to access to any mongo_dart classes just use :


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