cant assign field.value property in a Tfield inside a list Access Violation error always appear how to solve this

Question

i have a Form name brazil and button save(Button3Click) and 4 Tedit field (Edit1Coach,Edit2Vice,Edit3Captain,Edit4Keeper) to Insert values in it when user click button save this what should happen

procedure TBrazil.Button3Click(Sender: TObject);
var
  FieldList: TList<TStringField> ;
  Field: TField;
  Paramters: DataBase_Param;
  i : integer ;
  x : Variant  ;
begin
  FieldList := TList<TStringField>.Create;
  try
    //Paramters.Create(Self);
    FieldList.Add(TStringField.Create(nil));
    FieldList.Add(TStringField.Create(nil));
    FieldList.Add(TStringField.Create(nil));
    FieldList.Add(TStringField.Create(nil));
    FieldList.Add(TStringField.Create(nil));
Field := FieldList[0];
    Field.FieldName :='Coach';
    Field.Value:=(Edit1Coach.Text);

    Field := FieldList[1];
    Field.FieldName := 'Vice';
    Field.Value :=(Edit2Vice.Text);

    Field := FieldList[2];
    Field.FieldName := 'Captain';
    Field.Value :=(Edit3Captain.Text);

    Field := FieldList[3];
    Field.FieldName := 'Keeper_coach';
    Field.Value :=(Edit4Keeper.Text);

    Field := FieldList[4];
    Field.FieldName := 'Country';
    Field.Value :=('Brazil');

  save_record_to_Db_theory(Paramters, FieldList ) ;

  finally

    for Field in FieldList do
    Field.Free;
    FieldList.Free;
  end;
end;

I created in this method list of TStringField and every value will insert in it the problem is that when i try to set the value of Field.Value acess violation error accure althought that when i set the value of Field.FieldName it assigned succifully hat should happen ??

i changed the list from TList<Field> to TList<TStringField> and i change Field.Value with Field.AsString and Field.text but always this error appear and checked if (FieldList.Count > 0) and (FieldList[i] is TStringField) and they always return true and the same error happen again