Unable to find partition for path '/sdcard' in TWRP I have been trying to root my Nexus 5x running Android 7.1.2 (N2G47F)

So put SuperSU.zip file to install it from TWRP.

I executed following command -
fastboot flash recovery twrp-3.0.2-0-bullhead.img

But when I get into TWRP I can not find SU file becouse TWRP can not find nexus build in card.

In log console I am getting following error.

Unable to find partition for path '/sdcard'

any ideas?

Thanks!
Sounds like encryption is blocking the recovery from accessing the internal storage. Try using the latest version here.