When I executed xl2tpd I amhaving following error.

# xl2tpd -D
xl2tpd[845]: parse_config: line 13: data 'ipsec sared=yes' occurs with no context
xl2tpd[845]: init: Unable to load config file

When I remove the "line 13" I having same error with "Line 14" thefore I do not think that the problem is about "ipsec sared" Here is my configuration file xl2tpd.conf.

LINUX Ubuntu 12.0.4 ;Openswan IPsec 2.6.37; xl2tpd version: xl2tpd-1.3.1

; [global]                                                             
 ipsec sared=yes
 listen-addr=47.168.137.27

; [lns default]
 ip range = 192.168.1.10-192.168.1.20
 local ip = 192.168.1.1
 require chap = yes
 refuse pap = yes
 require authentication = yes
 ppp debug = yes
 pppoptfile = /etc/ppp/options.xl2tpd
 length bit = yes
 name=LinuxIPSECVPN

ANSWER:(since have not enough reputation I am writting it over here.) removing the ";" character at the beginning of [global] and [lns default] have solved the issue. At fist I tought that [global] and[lns default] were just a comment.