umask 에 대한에러..데몬실행 안됨[vsftpd]

에러 코드 내용

[root@test ~]# /usr/local/sbin/vsftpd/vsftpd &
[1] 12074
500 OOPS: [root@test ~]# unrecognised variable in config file: umask

[1]+  Exit 1                  /usr/local/sbin/vsftpd/vsftpd
[root@test ~]#

====================================================

vsftpd.conf 파일 내용 
10 라인의 umask 줄에서 에러가 나는뎅..무슨 이유죠...?? ㅠ.ㅠ
주석처리하면 잘 되는뎅..

      1 #StandAlone Set
      2 listen=YES
      3 listen_port=21
      4 pam_service_name=vsftpd
      5
      6 #Real name set
      7 anonymous_enable=NO
      8 local_enable=YES
      9 write_enable=YES
     10 umask=022
     11
     12 #connect set
     13 max_clients=50
     14 max_per_ip=2
     15 one_process_model=NO
     16 idle_session_timeout=120
     17 data_connection_timeout=300
     18 connect_timeout=60
     19 local_max_rate=0
     20 ftpd_banner=WELCOME TO WEB
     21
     22 #Secure Set
     23 chroot_local_user=YES
     24 hide_ids=NO
     25 ls_recurse_enable=NO
     26 connect_from_port_20=YES
     27 xferlog_enable=YES
     28 xferlog_file=/var/log/vsftpd.log
     29 ascii_download_enable=NO
     30 async_abor_enable=NO