Hi, guys. I'm getting this error too. I manually replaced all files from the latest Atmosphere and Hekate releases in my SD card. I still can't get it to work. I'm on 8.0.0 and using a RCM dongle with latest Hekate payload.
Thank you in advance guys.
Edit: OK, nevermind, I followed the basic instructions in switchgui.de and wasn't doing it right. I needed to use Launch > Payloads > fusee-primary in Hekate. Just saying in case someone has this problem too.