COM Exception in DXLImporter

Hi all.

I’m trying to implement DXL importing functionality through COM and VB.NET using DxlImporter class. I wrote a code in VB, that does that successfully with, let’s say, mail8.ntf, but when I try it to use in database (application) which is inherited from names.ntf, DXLImporter::Import function call throws a COMException(0x08001411AA).

Had anyone experience like that. Or logically what can be the cause?

Thanks in advance.