kvm virtual harddisk error

Hi!

I have a little prob since 4 days. When backing up a virtual machine (kvm) i get errors that the file volume 'NFS1:116/vm-116-disk-1.raw' does not exist.

I checked filesystem and the image exists. But when i do a

ls -lah in that directory i get:

ls: cannot access /mnt/pve/NFS1/images/116/vm-116-disk-1.raw: Stale NFS file handle
total 29G
drwxrwxrwx 2 4294967294 4294967294 6 Mar 23 05:55 .
drwxr-xr-x+ 24 4294967294 4294967294 24 Mar 26 11:29 ..
-?????????? ? ? ? ? ? vm-116-disk-1.raw
-rw-r--r--+ 1 4294967294 4294967294 25G Apr 11 07:38 vm-116-disk-2.raw
-rw-r--r--+ 1 4294967294 4294967294 20G Apr 11 07:38 vm-116-disk-3.raw
-rw-r--r--+ 1 4294967294 4294967294 50G Apr 11 07:38 vm-116-disk-4.raw

What can i do?