Solution found....
You should insert something into text/image column before copy text/image into it. I mean, this value should not be null. You should write (for example):
INSERT INTO [dbo].[images] VALUES ('1', 0x0, null)
instead of:
INSERT INTO [dbo].[images] VALUES ('1', null, null)
Otherwise, you will get the following error message:
ERROR: Text or image pointer and timestamp retrieval failed.