Is the ROM xiaomi.eu custom rom? If no, then you should ask for support on the forum you downloaded the rom.
This forum provides support for Xiaomi.eu custom ROMs only.
Just download the latest stable here, format data in twrp and flash again.
Should be all good.
If not, download a fastboot rom and start from scratch, using Miflash tool or just flash through fastboot.
If you use MiFlash remember to use clear all option only, without relocking the bootloader.