In step 3 [Modify the user Experience] - Is there something wrong with me if i got the error message below. I have no clue what i missed in a given error below. Please help me achive . TIA

There was an unhandled exception. Please reference ID: ITTCFINE. Error: Faraday::ResourceNotFound. Message: NOT_FOUND: The requested resource does not exist 
Note: you may run into errors if you've skipped previous steps.