First, we'd need to know what model Roku players you have, and which is giving the message. Not the name, the model number.
Not every channel in the Roku channel store will work on all devices. That is not something that Roku controls. It is under the sole control of the channel developer, in this case Sling. Are they dropping support for some players? Certainly a possibility, but only Sling can answer that question.
Dan
Roku Community Streaming Expert
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