I'm assuming you're following the Clover guide, read the post install.
Place kexts from /EFI/Clover/kexts/Other/LE into /Library/Extensions
Then run the permission fix and rebuild cache.
You might have to reboot a couple of times
If it still fails, then copy this into /Library/Extension and repair permission and rebuild cache again. Make sure successful build and no error
Also link to the post you'e getting the boot files from for review