load all files in a directory Prolog

Hi, I am trying to load all files in a directory but I couldn't do it with
the following command:

rdf_attach_db( Directory, [silent(false)] )

I get 0 graphs loaded as shown below:

% Loaded 0 graphs (0 triples) in 0.00 sec. (1560% CPU = 0.02 sec.)


Please help me!

Batselem Jagvaral
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