I don't think there is any cable.xml file, generally it's needed,

In there I can find only /etc/tuxbox the satellite and terrestrial files, but not cable, perhaps this is the reason ? Check if it's the same in your image as it's an old one of more than 1 year ago.

TS
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DM8000, DM800se, DM500HD, DM800HD, DM7025, DM7020s, DM7000, DM500s
VU+ Solo, VU+ Uno, VU+ Duo, Kathrein UFS910
Tivusat, TNTSat, Fransat, SSR/TSR, BBC1-2-3/ITV
DE-OpenBlackHole 1.4 image : http://www.openblackhole.com/