why these error "We couldn’t find the Review Record Page activated as the org default" occured even after completing all the steps

Hi @Shamia Parween I am a member of Trailhead Help, Could you please let us know if you have followed the above suggestion and the issue is resolved? If yes, please mark that response as the best answer which helped you to resolve and close this thread. 

If you are still facing any issues with this unit please let us know so that we can check and assist further.

Looking forward to your response :)

Thank you !