/data/misc/qer corrupted file

Today i try to do a nandroid backup with TWRP on my moto g before installing a cunstom rom,
After a seconds i get Error: 255, that indicates a corrupt file, looking for the last_log of twrp I saw this:

I:addFile '/data/misc/qer' including root: 1
I:Error adding file '/data/misc/qer' to '/usb-otg/TWRP/BACKUPS/0423292817/2016-09-11--11-29-18_KXB20.25-1.31//data.f2fs.win000'
Error creating backup.
I:ERROR tarList for thread ID 0
Error creating backup.
I:InfoManager saving '/usb-otg/TWRP/BACKUPS/0423292817/2016-09-11--11-29-18_KXB20.25-1.31/data.info'
createTarFork() process ended with ERROR: 255
Backup Failed. Cleaning Backup Folder.
I:Copying file /tmp/recovery.log to /usb-otg/TWRP/BACKUPS/0423292817/2016-09-11--11-29-18_KXB20.25-1.31/recovery.log

But when I enter this folder (data / misc) using root explorer, I don't see any qer file, and when I try to create a file with the same name appears: "Operation failed". (I can creat any other file with diferent name is this folder).
I don't know what this file is, and I want to delete it.
Someone has had a similar problem or know how to solve?

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