unable to mount /system - but everything OK

Hi,
i have an LG G4 INT. Unlocked Bootloader. TWRP latest installed.
As rom i use 7HD 7.4.
Everything works fine!

Now i wanted to backup the partitions (before installing xposed), i enter TWRP, click backup, slide, then:

E: unable to mount /system
Number of partitions to bacup: 4
Total size of all data: 10134MB
Backup folder......
.
.
.
E: unable to mount /system

Before reboot inTWRP, i get a message "No os installed..........".
But the device works fine!
Also reinstalling 7HD rom (without wipe!) does not work, same error....


Any idea?

Thanks

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