Error in Software Manager

I am new to OpenSUSE and just started dual booting OpenSUSE Xfce and Linux Mint Xfce on my netbook.
I have this error in Yast when opening up the Software manager:

>>
Cannot access installation media
hd:///?device=/dev/disk/by-id/scsi-1ALCOR_ALCOR
(Medium 1).
Check whether the server is accessible.

hd:///?device=/dev/disk/by-id/scsi-1ALCOR_ALCOR

Empty destination in URI: hd:///?device=/dev/disk/by-id/scsi-1ALCOR_ALCOR
<<

I have turned off Firewall. Sometimes it works without error. Sometimes it gives me this message. What does it mean and what do I do to fix it?