error by calling: YaST => System = bootloader


I have installed openSUSE-13.2 While calling YaST => System => Bootloader
an error message appears:

Internal error. Please report a bug report with logs.
Details: Unknown device tmpfs.
Caller: /usr/share/YaST2/lib/bootloader/device_mapping.rb: 65:in ´to_mountby_device`

What happens here? Is this a bug? This error does not appear on a second PC with
the same installation.


nfs-mount in fstab?

Thanks for the hints.

But one question: Why does it work perfectly on two other PCs
with two NFSs in fstab and both connected in LAN?

What has this one PC especially that shows the error message?