Trying to connect to Business One with DI API C#

Hello, I'm getting an error message on this line : oCompany = new SAPbobsCOM.Company();

The erro message :

Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG))

Erreur source:

Ligne 61 :         public string Connexion()
Ligne 62 :         {
Ligne 63 :             oCompany = new SAPbobsCOM.Company();