The error says there is not enough room to launch the channel. I deleted some channels I never watch and same error message. I looked here and found people with the same problem and a message that an update would fix it. Tried to update. No update available. Very frustrating.
Since the issue persists even after performing a software update on your Roku device, click here and follow @RokuDanny-R's latter instructions so we can further investigate the problem. We are aware that there are customers who are still getting the error message and the assigned Roku team is continuously working on it.
Meanwhile, we'll be closing out this thread and we recommend updating us in the thread linked above.