Generic ANT channel in CIQ 1.2 (Epix) question

Apologies if this is a dumb question, I am new to CIQ programming. I've cobbled together a widget for the Fenix 3 that detects a Chirp geocache beacon using a generic ANT+ channel (just for testing, it only displays the ID of the Chirp). It works fine on the Fenix 3, but on the Epix, it initializes allright, then fails at msg.getPayload(). The log contains "Unable to close bike power sensor" warnings, but from what I've Googled those can be red herrings. I need to add some debug logging to the code of course, but I would like to know; is handling generic ANT+ channels on the Epix different?