Ok...
Make sure you phone is unlocked.
First you need to install official xiaomi rim from xiaomi, not xiaomi.eu.
After that, make the encryption.
After encryption is done,
Download Xiaomi.eu rom, latest TWRP.
Install TWRP, via fastboot.
Reboot to TWRP after installing, otherwise you will go back to official recovery.
In TWRP, install the rom from xiaomi.eu.
After it finishes, go-to mount and mount system folder
Then you will have access to system folder and subfolders.
Start file manager in TWRP (under advanced menu)
Go to /system/vendor/etc
Copy fstab.qcom to your PC.
Edit the fstab.qcom file and change encryptable=ice to fileencryption=ice
Copy the modified file to you phone.
From file manager in the phone copy the modified fstab.qcom file to /system/vendor/etc
Then reboot..
Should work...
Sent from my MI 6 using Tapatalk