Thanks for your post here. I apologize for the experience you're running into. In order to gather more information and better understand the specific issue you're seeing, we need more information about your device setup, attempted troubleshooting steps, and account/regional location info to help clarify further, and allow us to provide additional troubleshooting guidance.
There many different factors to take into consideration that may cause a message like that to appear, depending on usage, etc—the cause of which may not be the same in all cases. This is why it is important for us to gather more information.
If you have followed the troubleshooting steps outlined in previous posts without success and are still experiencing the issue, please send me a private message with your Roku account email address, the serial number of your Roku device from Settings>System>About, more information about the troubleshooting you've attempted, and cite the specific channel(s) you're trying to add when you receive an error. I'd be happy to follow up with you from there to continue investigating the issue and provide additional options if needed.
Roku Community Manager