Unable to mount /data - Can't flash using MiFlash - Looking for help. :(

Every time I open TWRP(V2.8.6.0) this message shows on the log.

Quote:

E: Could not mount /data and unable to find crypto folder. E: Unable to mount '/data' E: Unable to recreate /data/media folder Updating partition details... E: Unable to mount '/data' ..done E: Unable to mount storage. E: Unable to mount /data/media during GUI startup. Full SELinux support is present. E: Unable to mount /data/media/TWRP/.twrps when trying to read settings file. E: Unable to mount '/data' MTP Enabled E: Unable to mount '/data'

I am trying to restore from Stock Partition but it seems the update doesn't fix the partition because of this error.
I think my userdata.img is broken but I don't know how to fix it. I even tried to flash using MiFlash but I wasn't able to flash because of my current partition. I can access fastboot, recovery, adb, and OTG. Can someone please help me with this problem. I've been trying to search for a fix for this problem for a looooong time. :(

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