Abstract Error @ TMVCActiveRecord.Count 【sql server】

[holdelphi]

env: Windows server 2012 r2, MS SQL SERVER 2017, DX 10.3
dMVCFramework version: 3.2.0 RC6 released
demo : activerecord_showcase

procedure TMainForm.btnCRUDClick(Sender: TObject);
...
Log('There are ' + TMVCActiveRecord.Count().ToString + ' row/s for entity ' + TCustomer.ClassName);
....
Show error: Abstract Error

No problems on update & insert & delete.