Problem accessing HDD on airport extreme

Hi to everyone, I have one problem and if anyone could help it would be great.

I have RPi2 with latest OSMC kodi installation on it and RPi2 is connected with wire to the airport extreme base station.
I have a powered usb hub connected to the AE and there are 2 HDD’s in that hub.
From today, I can’t get access to one HDD in kodi.
With username and password for AE I can access one HDD (320 GB) but not the other one (2 TB). Until yesterday both were accessible normally.
I get “Eror : 2 share not available”.
Both HDD’s are normally mounted on AE, I can access both of them on my Mac, but what ever I’ve tried in Kodi doesn’t work.

Any help would be appreciated.