httpd could not be started

Hello Everyone,

I am using Material Studio 6.1 with the Red Hat Enterprise Linux Server release 6.3 (Santiago).

Material Studio 6.1 service stoped and when I am trying to start it then getting below error message :

Server configuration complete
Starting gateway at serverlogin1:18888
(98)Address already in use: make_sock: could not bind to address [::]:18888
(98)Address already in use: make_sock: could not bind to address 0.0.0.0:18888
no listening sockets available, shutting down
Unable to open logs
/home2/accelrys/Accelrys/MaterialsStudio6.1/etc/Gateway/root_default/httpd/bin/apachectl start: httpd could not be started
Gateway failed to start.

Please help us resolve above issue ...
Thanks in advance!!!!!!!!!!!!

Regds
Anto