Centos 7 -- Unable to Acces vboxadditions_5.0.0_101573

[FranKo8]

Hi.

I am new to the forum, and I do hope I can rely on the wisdom of the older heads here.

I recently installed Centos 7 on VirtualBox 5.0 successfully. I also have Oracle 11g R2 installed on it as well. When I attempted to mound box additions, it would give me the following message:

Unable to Acces "VBOXADDITIONS_5.0.0_101573"
Error mounting /dev/sr0 at /run/media/oracle/VBOXADDITIONS_5.0.0_101573: Commandline 'mount -t "iso9660" -0
"uhelper=udisks2,nodev,nosuid,uid=502,gid=501,iocharset=utf8,mode=0400,dmode=0500"
"/dev/sr0" "/run/media/oracle/VBOXADDITIONS_5.0.0_101573" exited with non-zero exit status 32:mount: unknown filesystem type 'iso9660'


What do I do to solve this matter?

Thank you

[aks]

Is iso9660 module loaded (lsmod | grep iso to find out - if not modprobe isofs)?
Have you got your physical CD drive locked (is there's a disc in it)?