If you are getting an error while loading fss0 atmosphere and fusee secondary, the files you need to use the emulator must be on your Switch’s storage drive. This error is caused by one of two things. First, an update is likely to remove some configuration files that are required for the emulator to function. If this is the case, you may want to check if you have the latest stable builds of these programs. Second, if you have been using a previous stable build of fss0, you may want to check whether you have the latest patch.
Third, you may want to use a different boot method for Atmosphere. For example, it may be best to use sysNAND instead of emuNAND. However, you may find it useful to use emuMMC to boot Atmosphere. This method is not supported by all patches and requires you to use the emuMMC boot option. Moreover, you should not try to use the fusee-secondary boot method with Blawar’s Tinfoil as it will delete any files from your SD card.