VPN PPTP-client connection to Server

Dear Team,

I'm new with your product and previously some other guy installed Fortigate 30D device.

Currently we have 1 wan connection with PPPOE and 1 IPSec VPN connection to other Fortigate device.

I trying to setup extra VPN PPTP connection to some 3rd party VPN server to forward specific traffic through that connection.

config system interface
    edit "wan"
        set mode pppoe
        set allowaccess ping https fgfm
        set type physical
        set snmp-index 1
        set username "abcd"
        set password ENC lXFFP1SLc3RBTV/zV+1jx7PX6W9hwFXxQYdIekUjsupEpf17/e0mpktySmeaZutf2TdsKJV/IC3Q/MCch5180BiuOuJO1LziVLw0zwP0g7zglF8PMdtkb9soJWqu0XPBBpn6GevmJH4u1YumZEXTCw/gdkV9ZPchA82O8Snac4O5rRxfA2rzyFbVPnnoZtPQWHmXrw==
    next
    edit "modem"
        set mode pppoe
        set type physical
        set snmp-index 2
    next
    edit "ssl.root"
        set type tunnel
        set alias "SSL VPN interface"
        set snmp-index 5
    next
    edit "lan"
        set ip 192.168.10.1 255.255.255.0
        set allowaccess ping https ssh http fgfm capwap
        set type hard-switch
        set listen-forticlient-connection enable
        set snmp-index 6
    next
    edit "To_I"
        set type tunnel
        set snmp-index 3
        set interface "wan"
    next
end

Then i got some research and added pptp interface and failed...

FGT30D3X15015808 (pptp) # show
config system interface
    edit "pptp"
        set pptp-client enable
        set snmp-index 4
        set pptp-user "123456"
        set pptp-password ENC /L8/e+4H8yGE8aa1BdenVkXp0ZuKGd5jthMqCwpIPBihldCObZWG/qYCHwFJJCbbIsodFWLn7DgdugCoBaWdbyGbGFlo+n+RkMBppkfRep9vOK8Xd+7atxfdUsaVfFckVPKH8724IurxHBlIWcZekfxKtoR56L+tPnf/xUTpN3uwp7qAZ2xs6d/LsDlOku7xs9Z7jw==
        set pptp-server-ip x.x.x.x
        set pptp-auth-type mschapv2
        set pptp-timeout 200
        set interface "wan"
    next
end
 
FGT30D3X15015808 (pptp) # end
node_check_object fail! for vlanid 0
Attribute 'vlanid' value '0' checkingfail -158
Command fail. Return code -158

Please help me in that question.