Why does RegistrationServices.RegisterAssembly() return FALSE?

Question

I wrote this code to register my assembly with COM-interface:

var rs = new RegistrationServices();
var b = rs.RegisterAssembly(Assembly.GetExecutingAssembly(),                                                                                                     AssemblyRegistrationFlags.SetCodeBase);

At the end of execution b equals false . I don't understand what I am doing wrong? Is there any way to get more information why registration fails?

Thank you!