If you're having the exact same error as me, remember to download the latest atmosphere, and importantly, Fusee.bin. The Fusee.bin doesn't go in your root if you're using Hekate. You need to go to the Bootloader folder, and replace the Fusee.bin in there with the new one. I also updated literally everything else too in the process (sigpatches, hekate etc) but I think it was the Fusee.bin not being in the right folder that was causing the error.
Make sure you follow ALL the hekate v5.7.2 instructions in the notes, especially the part stating, "And make sure that atmosphere/contents folder does not have old Atmosphere components."If you're having the exact same error as me, remember to download the latest atmosphere, and importantly, Fusee.bin. The Fusee.bin doesn't go in your root if you're using Hekate. You need to go to the Bootloader folder, and replace the Fusee.bin in there with the new one. I also updated literally everything else too in the process (sigpatches, hekate etc) but I think it was the Fusee.bin not being in the right folder that was causing the error.