If the above steps don't resolve the issue, you may need to perform some advanced troubleshooting steps:
: On newer devices with "system-as-root" (A-only or A/B), the recovery may fail to unmount or access /system_root , leading to a "resource busy" error. magisk error 1
Error 1 often appears in TWRP because the boot partition isn't mounted properly. If the above steps don't resolve the issue,
Don't panic. Error 1 is rarely fatal. In most cases, it simply means Magisk cannot find a valid boot image to patch. magisk error 1