Hi hanumaan2111,
Thanks for your first post in the Roku Community!
We understand that you are getting an error message when activating your Roku device. We're sorry if you are having difficulties.
Our FAQ provides additional information and complete steps on How to activate or link your Roku streaming device | Official Roku Support
If the issue still persists, please provide us with the serial number of your Roku device (printed on the side/back of the device) and I'll have our Support team reach out directly to assist you further.
Please keep us posted and we'll continue assisting you from there.
Best regards,
Mary