Ошибка could not convert variant of type

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DataModule1.ADOQuery1.Append;

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procedure QueryRestart;
begin
  DataModule1.ADOQuery1.Close;
  DataModule1.ADOQuery1.Open;
  DataModule1.ADOQuery2.Close;
  DataModule1.ADOQuery2.Open;
  DataModule1.ADOQuery3.Close;
  DataModule1.ADOQuery3.Open;
  DataModule1.ADOQuery4.Close;
  DataModule1.ADOQuery4.Open;
  DataModule1.ADOQuery5.Close;
  DataModule1.ADOQuery5.Open;
end;
 
procedure TForm1.Button1Click(Sender: TObject);
begin
  DataModule1.ADOQuery1.Append;
end;
 
procedure TForm1.Button2Click(Sender: TObject);
begin
  DataModule1.ADOQuery1.Edit;
end;
 
procedure TForm1.Button3Click(Sender: TObject);
begin
  if temp = 0 then
    DataModule1.ADOQuery1.Delete
  else if temp = 1 then
    DataModule1.ADOQuery2.Delete
  else if temp = 2 then
    DataModule1.ADOQuery3.Delete
  else if temp = 3 then
    DataModule1.ADOQuery4.Delete
  else if temp = 4 then
    DataModule1.ADOQuery5.Delete;
  QueryRestart;
end;
 
procedure TForm1.Button4Click(Sender: TObject);
begin
  DataModule1.ADOQuery1.FieldByName('Name').AsString := Form1.Frame41.Edit1.Text;
  DataModule1.ADOQuery1.FieldByName('Category').AsInteger := Form1.Frame41.RadioGroup1.ItemIndex;
  DataModule1.ADOQuery1.FieldByName('Breafing').AsString := Form1.Frame41.Memo1.Lines.Text;
  DataModule1.ADOQuery1.FieldByName('Final').AsString := Form1.Frame41.Memo2.Lines.Text;
  DataModule1.ADOQuery1.FieldByName('End').AsDateTime := Form1.Frame41.DateTimePicker1.Date;
  DataModule1.ADOQuery1.Post;
  QueryRestart;
end;
 
procedure TForm1.Button5Click(Sender: TObject);
begin
  DataModule1.ADOConnection1.Cancel;
end;
 
procedure TForm1.DBGrid1Enter(Sender: TObject);
begin
  DataModule1.ADOQuery1.Cancel;
  temp := 1;
  if DataModule1.ADOQuery2.FieldByName('Name').IsNull then
     ClearFields
  else
  begin
    Form1.Frame41.Edit1.Text := DataModule1.ADOQuery2['Name'];
    Form1.Frame41.RadioGroup1.ItemIndex := DataModule1.ADOQuery2.FieldByName('Category').AsInteger;
    Form1.Frame41.Memo1.Lines.Text := DataModule1.ADOQuery2['Breafing'];
    Form1.Frame41.Memo2.Lines.Text := DataModule1.ADOQuery2['Final'];
    Form1.Frame41.DateTimePicker1.Date := DataModule1.ADOQuery2.FieldByName('End').AsDateTime;
  end;
end;
 
procedure TForm1.DBGrid2Enter(Sender: TObject);
begin
  DataModule1.ADOQuery1.Cancel;
  temp := 2;
  if DataModule1.ADOQuery3.FieldByName('Name').IsNull then
    ClearFields
  else
  begin
    Form1.Frame41.Edit1.Text := DataModule1.ADOQuery3['Name'];
    Form1.Frame41.RadioGroup1.ItemIndex := DataModule1.ADOQuery3.FieldByName('Category').AsInteger;
    Form1.Frame41.Memo1.Lines.Text := DataModule1.ADOQuery3['Breafing'];
    Form1.Frame41.Memo2.Lines.Text := DataModule1.ADOQuery3['Final'];
    Form1.Frame41.DateTimePicker1.Date := DataModule1.ADOQuery3.FieldByName('End').AsDateTime;
  end;
end;
 
procedure TForm1.DBGrid3Enter(Sender: TObject);
begin
  DataModule1.ADOQuery1.Cancel;
  temp := 3;
  if DataModule1.ADOQuery4.FieldByName('Name').IsNull then
    ClearFields
  else
  begin
    Form1.Frame41.Edit1.Text := DataModule1.ADOQuery4['Name'];
    Form1.Frame41.RadioGroup1.ItemIndex := DataModule1.ADOQuery4.FieldByName('Category').AsInteger;
    Form1.Frame41.Memo1.Lines.Text := DataModule1.ADOQuery4['Breafing'];
    Form1.Frame41.Memo2.Lines.Text := DataModule1.ADOQuery4['Final'];
    Form1.Frame41.DateTimePicker1.Date := DataModule1.ADOQuery4.FieldByName('End').AsDateTime;
  end;
end;
 
procedure TForm1.DBGrid4Enter(Sender: TObject);
begin
  temp := 4;
  if DataModule1.ADOQuery5.FieldByName('Name').IsNull then
    ClearFields
  else
  begin
    Form1.Frame41.Edit1.Text := DataModule1.ADOQuery5['Name'];
    Form1.Frame41.RadioGroup1.ItemIndex := DataModule1.ADOQuery5.FieldByName('Category').AsInteger;
    Form1.Frame41.Memo1.Lines.Text := DataModule1.ADOQuery5['Breafing'];
    Form1.Frame41.Memo2.Lines.Text := DataModule1.ADOQuery5['Final'];
    Form1.Frame41.DateTimePicker1.Date := DataModule1.ADOQuery5.FieldByName('End').AsDateTime;
  end;
end;
 
procedure TForm1.DBGridListEnter(Sender: TObject);
begin
  DataModule1.ADOQuery1.Cancel;
  temp := 0;
  if DataModule1.ADOQuery1.FieldByName('Name').IsNull then
    ClearFields
  else
  begin
    Form1.Frame41.Edit1.Text := DataModule1.ADOQuery1['Name'];
    Form1.Frame41.RadioGroup1.ItemIndex := DataModule1.ADOQuery1.FieldByName('Category').AsInteger;
    Form1.Frame41.Memo1.Lines.Text := DataModule1.ADOQuery1['Breafing'];
    Form1.Frame41.Memo2.Lines.Text := DataModule1.ADOQuery1['Final'];
    Form1.Frame41.DateTimePicker1.Date := DataModule1.ADOQuery1.FieldByName('End').AsDateTime;
  end;
end;

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Form1.Frame41.Edit1.Text :=DataModule1.ADOQuery2.DataSource.DataSet.FieldByName('Name').Value;
//или
Form1.Frame41.Edit1.Text :=DataModule1.ADOQuery2.DataSource.DataSet.FieldByName('Name').asString;

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DataModule1.ADOQuery2.Append; 
DataModule1.ADOQuery2.DataSource.DataSet.FieldByName('Name').Value:='Привет';
DataModule1.ADOQuery2.Post;

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BDGrid.DataSource.DataSet.FieldByName('Name').Value:='Привет';

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DataModule1.ADOQuery2.FieldByName('FIO').Value:='Привет';