Delete the /atmosphere/ and /bin/ folders from your SD card (don't worry, your games are in /Nintendo/ or /emuMMC/ ).
The vast majority of "reviews" regarding this error come from the modding community. This error typically appears when trying to boot a Custom Firmware (CFW) like Atmosphere via hekate. pkg2 read failed
A firmware update (via Daybreak or ChoiDujourNX) that didn't finish properly. Step 1: Update Atmosphere and Hekate (The Most Common Fix) Delete the /atmosphere/ and /bin/ folders from your