How to configure switch auto-configuration command on DGS-3630 series

[Topology]
TFTP server-----[p2]DHCP Server(DGS-3630)[p1]------[p1]DHCP Client(DGS-3630)

NOTE:
DHCP server: 10.90.90.90
TFTP server: 10.90.90.1
DHCP POOL:  10.90.0.0/16 (excluded-address 10.90.90.90 to 10.90.90.254)


[Configuration]
##DGS-3630(DHCP Server)
config t
ip dhcp pool DATA_LAN
network 10.90.0.0 255.255.0.0
default-router 10.90.90.90
option 66 ip 10.90.90.1
bootfile test.cfg
next-server 10.90.90.1
dns-server 8.8.8.8
domain-name dlink.com
exit
ip dhcp excluded-address 10.90.90.90 10.90.90.254
service dhcp

## DHCP Client (DGS-3630)
configure terminal
interface vlan 1
ip address dhcp
exit
autoconfig enable

[Test Step & Result]
1) Reset default on 2 x DGS-3630
2) Connect as topology 
3) Configure configraiton on DHCP server & client 
4) Put the DGS-3630's config file(test.cfg) to TFTP server's folder 
5) Reboot DHCP client 
6) After reboot DHCP client, the client will auto-config the settings as the confg file(test.cfg) 
The LOG from DHCP Client when it is booting: 
======================================

Press any key to login...

 Start auto configure, lock CLI for process!
 
 Try to download configure from TFTP://10.90.90.1/test.cfg......
 Accessing tftp:......
 Transmission start......
 Transmission finished, file length 2206 bytes.
 Executing script file test.cfg ......  Done. 
 Please wait, save configure to file test.cfg ......  Done. 
 Set /c:/test.cfg as boot configure OK
 Auto configure process OK.
 Auto configure OK: Unlock CLI.
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