Migration DHCP from windows 2003 to Windows 2008R2 error

Good day ,

I m trying to migrate DHCP from windows 2003 (frensh) service Pack2 to windows 2008R2 (english) I did the following :

On windows 2003:

1-I export the database of DHCP from 2003  "netsh dhcp server export C:\dhcp.txt all"

2-I stoped DHCP service "net stop dhcp server"

On windows 2008R2:

1-I import the databse to DHCP server 2008R2 "netsh dhcp server import c:\dhcp.txt all"

 so I receive an error message :
Error while importing class "Default Routing and Remote Access Class."
This class conflicts with the existing class "Classe de routage et d'accès distant par défaut." An internal error occurred.
Can you please help me will be thankful .

Regards

e