Getting error while shutting down oracle DB instances

Hi,
I am system engineer working for a private film.
I mostly support on Unix server that is IBM AIX server for the clients .In one of the server we are using ora11gR2 and ora10gR2 database, when I try to shutdown the DB I am getting an error as “could not open parameter file '/oradata3/oracle11g/ora11gR2/app/ora11gR2/product/11.2.0”.this is the first time I am getting error while shutting down the instances.
I will mention the two database and the instances name as “ora11gR2 18974 1 0 01:24:47 ? 0:21 ora_pmon_SOADB” “ora10gR2 19156 1 0 01:26:02 ? 0:19 ora_pmon_FLEXCJ” “ora11gR2 19072 1 0 01:25:13 ? 0:19 ora_pmon_FCPBDB”.
Please help.
Thanks.
