Thanks for posting in the Roku Community!
We appreciate you letting us know about the HDCP error with your Roku device and we will work with you to know what went wrong so we can assist you further and fix the issue.
Please be advised that HDCP errors happen when there is a problem with the physical connection or communication between your Roku and TV. Often, it's a simple matter of reconnecting the HDMI cable and switching to a different HDMI cable. For Roku Streaming sticks, and connecting to an HDMI extender.
If the error continues, review the suggestions for determining why from our Support page: What to do if you see an “HDCP Error Detected” message or a purple screen | Official Roku Support
Please keep us posted and we'll continue assisting you from there.