Tivo Network Remote Protocol Help

I am writing a program that uses the Tivo Network Remote Protocol. You can find it at: http://ift.tt/WuIZjF



I am having a problem with my Tivo Mini. It is rejecting "SETCH 203" with a CH_FAILED INVALID_CHANNEL response. Anyone know why this is failing? Channel 203 is valid and works perfectly on my Tivo 4 and Tivo Roamio.



Regards,

Ultrajones