This is the tuner I am using. Actually, if you check this post: Hauppauge DualHD not found on Vero4K - #10 by KickerTom you will see that you get the same error I was originally getting.
Support for this tuner has been added (backported) to the testing 4.9. kernel long time ago. I am using it for a while without any issues. So, if you feel adventurous, you can try the 4.9 kernel (although it would be good to have some initial knowledge of linux for this), otherwise wait for it to be released as stable and try it then.
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