If you would read the guide he linked you to, you would understand it instead of expecting to be spoon-fed.
1- If you are dumb enough to follow a YouTube video and have a problem, then ask the YouTube person who made the video about your...
Do check @Doctorbeefy's solution first as the fresh Atmosphere/Hekate install might not be necessary.
Are you on latest Atmosphere/Hekate/sigpatches at all? If you're not on firmware 17.x.x, did you clear your prodinfo at some point in the past...