ObjectLoader issue

Can you help me ?

I use ObjectLoader. When I initialize object ObjectLoader objLoader = new ObjectLoaderClass ();
the error is as follows:

Retrieving the COM class factory for component with CLSID {A00B572B-12D2-11D3-9F91-00C04F6BDF0E} failed due to the following error: 80040111 ClassFactory cannot supply requested class (Exception from HRESULT: 0x80040111 (CLASS_E_CLASSNOTAVAILABLE)).

I develop on vs 2010 and Arcgis engine 10.1.

Thanks !