Upon some light research, this error seems to be pretty generic. There is an issue with the Atmosphere files but its hard to point down which one. Some people report solutions after using the archive bit fix via Hekate while others got the issue resolved after formatting their SD card to FAT32. Whatever the case, the Atmosphere files you have on your SD card are no good so you most likely updated the CFW incorrectly. Whether you want to perform a clean install or try one of the fixes I mentioned, I'll leave up to you.
Okay, I figured I should try the archive bit fix via Hekate first like you suggested, since that would be the fastest thing I could try and it worked. You're a legend dude, as always