C# new RDOSession() throws exception

I'm trying to create Outlook email using Redemtion.

Part of my code:

RDOSession session = new RDOSession(); // throws exception 1
session.Logon(ProfileName, Password, false, true);

Send_Redemption(mail, ref session, MoveToFolder);

session.Logoff();

Exception 1:

Retrieving the COM class factory for component with CLSID {29AB7A12-B531-450E- 8F7A-EA94C2F3C05F} failed due to the following error: 80040154 Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG)).

Can someone suggest tell me why I get this, and hoe to correct that?

The error means Redemption was not registered. Have you tried to re-register it using regsvr32.exe?
What are the bitnessess of your app, Redemption and Outlook?
See http://www.dimastr.com/redemption/faq.htm#ErrorCreatingRedemptionObject for more details.
You might also want to use RedemptionLoader - this way you won't have to deal with the registry at all.