The argument type 'Object?' can't be assigned to the parameter type List

Issue

I have been trying to convert my app to new flutter new version but I got this error The argument type Object? can’t be assigned to the parameter type List that can’t be fix…. can somebody help me fix this problem

list() {
    return Expanded(
      child: FutureBuilder(
        future: employees,
        builder: (context, snapshot) {
          if (snapshot.hasData) {
            return dataTable(List<Url>.from(snapshot.data));
          }

          if (null == snapshot.data || snapshot.data == 0) {
            return Text("Tiada Data");
          }

          return CircularProgressIndicator();
        },
      ),
    );
  }

Solution

It is because you need to cast the type of your FutureBuilder. Based on your code I deduce that employees is of type Future<List> or at least Future<Iterable> then you should define the type of your builder like this:

FutureBuilder<Iterable>(
  future: employees,
  builder: (context, snapshot) {
    if (snapshot.hasData) {
      return dataTable(List<Url>.from(snapshot.data!));
    }

    // ...
  },
),

Answered By – Guillaume Roux

Answer Checked By – Marie Seifert (FlutterFixes Admin)