I saved some values in a List of Map values.

List<Map<String, String>> savedValues = [];

Now, I want to extract those values and keys in a List. I want to extract them as a String. When I try to do this and try to show these values in ListView.builder(), I am getting the error as mentioned above.

I am doing this.

    List _values = [];
    List _keys = [];

    for (var value in savedValues) 
       {
         _values.add(value.values);
         _keys.add(value.keys);
       }

I tried different solutions but did not understand, how to do it. Any help, please?