It is impossible to attach a library image to a virtual machine's CD-ROM:
Operation is finished with errors: Error invoking external utility: signaled .
The mount.cifs tool is not installed:
[root@mypcs ~]# which mount.cifs /usr/bin/which: no mount.cifs in (/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin)
You need to install the package which provides mount.cifs tool to the system:
[root@mypcs ~]# yum install cifs-utils