[Q] TWRP not mounting SD card topic

Phone memory( internal SDcard) in TWRP shows as 0MB and backup function desn't work.

Log:

Code:

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E:Unable to recreate and-sec folder
Updating partition details...
...done
E:Unable to mount storage
E:Unable to mount /sdcard during GUI startup
Full SELinux support is present
E:Unable to mount /sdcard/TWRP . twrps when trying to read settings file
Updating partition details...
...done
E:Unable to mount storage

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My phone is a Orange Rono(ZTE Blade Vec 4G) and the recovery is v2.8.5.5 TWRP.
What can I do for the internal storage to mount corectly?

Thanks in advance.

xda-developers