Multi site installation with cPanel showing Warning: symlink() [function.symlink]: File exists in
(1) You need to ensure if test1 does not exists there as directory to sub-domain. You will have to remove it and symbolic link will replace it and will point to main site directory.

Or alternatively....

(2) You can edit your sub-domain settings (from sub-domain manager in C Panel) and replace the file system path to /home/ioss/ashokks/ so that subdomain can point directly on main site without involving symbolic link as Options FollowSymLinks can be disabled in some server configurations.