Problem installing Apache server on SBS 2003

we cannot seem to load Apache server.
there is something wrong that we don't understand in the setup file

We get the following error message when we try to startup Apache:

Warning: DocumentRoot [/www/docs/dummy-host.example.com] does not exist
(OS 10013)An attempt was made to access a socket in a way forbidden by its acces
s permissions.  : make_sock: could not bind to address 192.168.10.200:8100
no listening sockets available, shutting down
Unable to open logs
Note the errors or messages above, and press the <ESC> key to exit.  15...

Topology:
T1 - Netgear FVS318 Router/Firewall - SBS 2003 server @ 192.168.0.200 (LAN IP)
Firewall open on ports 80 and 8080 and 8100
80 used for IIS
8080 and 8100 we want to use for Apache server

What does "no listening sockets available" mean.......??