Unable to set host credentials while setting jobs through OEM 12c

I am still getting following error while trying to create job through OEM 12c (12.1.0.1.0)  ERROR: NMO not setuid-root (Unix-only)

I checked the DOC ID: 1465278.1 and tried the solutions recommended but didn't still get the error resolved.

# ls -lh nm*

-rwx--x--- 1 root   oinstall 23K Jul 16 16:43 nmb

-rwxr-xr-x 1 oracle oinstall 23K Feb 11  2012 nmb.0

-rwx--x--- 1 root   oinstall 57K Jul 16 16:43 nmhs

-rwxr-xr-x 1 oracle oinstall 57K Feb 11  2012 nmhs.0

-rwx--x--- 1 root   oinstall 39K Feb 11  2012 nmo

-rw-rw-r-- 1 oracle oinstall 40K Jan 31  2012 nmo.0

NFS mount option in fstab:

 /oraData                  nfs     rw,bg,hard,nointr,rsize=32768,wsize=32768,tcp,noac,vers=3,timeo=600,actimeo=0,acregmin=0,acregmax=0,acdirmin=0,acdirmax=0

Please suggest.

Thank You !