The folder did not exist. However i had zero games on the switch at that point, after installing a game it actually booted up just fine. So my assumption is that it crashed due to no save file being available.Which microSD card are you using? Are you sure it's legit one (tried testing it with h2testw)? FAT32 formatted?
Is there a folder named0100000000000012
underatmosphere/contents
? If so, make a backup of it and see if the error shows up again after removing it.