the first "error"
"home/user_1/system-config-printer" -- no such file or directory
you did NOT run a command for the printer
you tried OPINING a file that did NOT exist
just HOW did you get that ?????
as in what did you do ?
the second one
you used "su" and NOT the NEEDED way to become root from a normal user
" su -" with a dash
there is a VERY big difference in the two
also why not use the web interface for cups
that above link is YOUR computer
but this is a VM install on a windows box so ???????
did you configure VB to allow the printer?
and if this is a wireless printer like most new ones are
you CAN NOT use it in a vm
also RHEL6 is not free so you DID pay the standard one year support contract
so you have access to the red hat knowledge base
( you will need to login to red hat )
if you are NOT going to pay for rhel then DO NOT use it
install one of the free rebuilds