Hey there Ehagberg,
Could you let us know if you have any luck? I have a new TiVo Mini purchased this month and have the same error message. It connects to the MOCA network with a 240 PHY rate, it can see the TiVo Roamio, I can view the Now Playing list. I can delete programs and change season passes. I can even connect to NetFlix, Amazon Instant, and Youtube via the MOCA connection and it streams perfectly with a very high-speed rate.
So it's nicely connected to the Internet and to the Tivo service.. but it just keeps showing the V112 error whenever I try to stream from the TiVo Roamio.
If Margaret is able to help you, then maybe I'll send a note as well. But I'll wait and hopefully hear some good news from you first.