type '_InternalLinkedHashMap<String, dynamic>' is not a subtype of type 'String' with AlphabetScrollView

I want to implement https://pub.dev/packages/alphabet_scroll_view in my project.

I receive data from backend and I parse it to list, but when I want to give it to above package as list I am getting this error:
type '_InternalLinkedHashMap<String, dynamic>' is not a subtype of type 'String'

This how my list is looking after parsing it:

[
{
 id: 1222,
 hidden: 1,
 nick_name: Saraya,
 id_fb: ,
 avatar: api/images/user/d4bfsd8769147.png,
 city: Toruń, Polska
}, 
{
 id: 2029,
 hidden: 1,
 etc.
}

and here is how I set it in my project:

AlphabetScrollView(
     list: (snapshot.data! as List).map((e) => AlphaModel(e)).toList(),
     selectedTextStyle: TextStyle(),
     unselectedTextStyle: TextStyle(),

I am not good with these Lists and Maps and I don’t have idea what I need to change to get rid of this error.

>Solution :

The constructor of AlphaModel expects a String but you are giving it a Map. Assuming you want to sort by nickname you can maybe do this instead:

 list: (snapshot.data! as List).map((e) => AlphaModel(e['nick_name']).toList(),