Pbs service is not starting on compute node after installation

Hi ,
Some one please help me on the below error. when i try to start pbs on compute node throwing below erro

[root@usflmia-xs01 ~]# /etc/init.d/pbs start
Starting PBS
pbs_mom: Operation not permitted (1) in chk_file_sec, Security violation “/1a/scratch” resolves to “/1a/scratch”
pbs_mom: parse_config, config[3] command “$jobdir_root /1a/scratch” failed, aborting
/opt/pbs/sbin/pbs_mom: config file(s) parsing failed
pbs_mom startup failed, exit 1 aborting.
[root@usflmia-xs01 ~]#

Below is configuration file
[root@usflmia-xs01 ~]# cat /var/spool/pbs/mom_priv/config
$clienthost usmina09
$restrict_user_maxsysid 2999
$jobdir_root /1a/scratch
$usecp *:/1a/staging/ /1a/staging/
$usecp *:/home_local/ /home_local/
$restrict_user_maxsysid 999
[root@usflmia-xs01 ~]#

What are the modes on /1a/scratch? They should be 1777 (drwxrwxrwt).

Also, depending on the version of PBS, if /1a/scratch is a shared directory (e.g., NFS), you should use

$jobdir_root /1a/scratch/ shared