I'm having issues adding a second IP address to one interface. Below is my /etc/networking/interfaces

   # The loopback network interface
auto lo
iface lo inet loopback

#eth0 is our main IP address
auto eth0
iface eth0 inet static
 address 198.58.103.*
 netmask 255.255.255.0
 gateway 198.58.103.1

#eth0:0 is our private address
auto eth0:0
iface eth0:0 inet static
 address 192.168.129.134
 netmask 255.255.128.0

#eth0:1 is for www.site.com
auto eth0:1
iface eth0:1 inet static
 address 198.58.104.*
 netmask 255.255.255.0
 gateway 198.58.104.1

When I run /etc/init.d/networking restart, I get a fail error about bringing up eth0:1:

RTNETLINK answers: File exists
Failed to bring up eth0:1.

Any reason this would be? I didn't have any problems with I first set up eth0 and eth0:0.