Cannot install Red Hat Satellite when using a CD-ROM media

Issue

• When trying to install the Red Hat Satellite 5.6 the error below is displayed:

[root@satellite Satellite-5.6.0 x86_64 Disc 0]# ./install.pl
* Starting the Spacewalk installer.
* Performing pre-install checks.
* Pre-install checks complete.  Beginning installation.
* RHN Registration.
** Registration: System is already registered with RHN.  Not re-registering.
* Checking for uninstalled prerequisites.
* Installing RHN packages.
Could not install RHN packages.  Most likely your system is not configured with the @Base package group. 
See the Red Hat Satellite Server Installation Guide for more information about Software Requirements.  
Exit value: 1.
Please examine /var/log/rhn/rhn_installation.log for more information.