Thanks for reporting this to the Roku Community. We'd like to check and try to help.
I understand that you are receiving an error message of "unfortunately an error occurred during playback" while accessing the Paramount plus channel.
We recommend starting here to troubleshoot channel issues: Follow these steps in order:
1. Navigate to the channel tile on the Roku home screen, press the * key on your remote, and choose 'Remove channel'.
2. Next, restart your device from Settings>System>System restart. (For Roku TV Settings>System>Power>System restart)
3. Once your player/TV starts up again, go to 'Streaming Channels' on the Home screen, and add the channel back once more.
In addition, try checking for any system updates in Settings>System>System update>Check now.
If this issue is not resolved, please help us with additional information provided below that would be helpful for our team to look into this problem.
-Roku device model
-software OS/version (these can all be found in Settings > System > About)
-does this issue occur on a specific channel? if so, what channel and what version/build is the channel (this can be found by selecting the channel on the Home screen and pressing the * button)
-tracker ID when this issue occurs (when you see this issue occur, press the Home button 5 times, followed by the Back button 5 times)
-what are you seeing on screen? Can you provide a screenshot of the issue or error message
-steps to reproduce the issue you are seeing
Please be aware that we are actively monitoring and investigating the discussions on this thread. Thanks again for your continued patience.