[Solved] List is not a subtype of type List Error in Flutter

In this post, we are going to show you how to solve "List<dynamic> is not a subtype of type List<Widget>" Error in Flutter. This error usually happens with Column(), Row(), Wrap(), Flex(), Stack() widgets which has multiple children. 

Error Message:

══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═════════════════
The following _TypeError was thrown building 
Home(dirty, state: _HomeState#133d8):
type 'List<dynamic>' is not a subtype of type 'List<Widget>'

This error usually occurs when you want to pass the children widget using Map or List. 

How to Solve Error:

To solve this error, you can simply put <Widget> on List loop on children parameter of any widget like below:

children:mapdata.map<Widget>(

For example: change the loop through the map on children parameter like below:

Column(
  children:mapdata.map((element){
      return Card(
          child: ListTile( 
              //widget tree
          ),
      );
  }).toList(),
)

Change this code like below:

Column(
  children:mapdata.map<Widget>((element){
      return Card(
          child: ListTile( 
              //widget tree
          ),
      );
  }).toList(),
)

Here, we have added <Widget> type on mapdata.map<Widget>. Now, run your app, this error will not occur on your Flutter App.