When we first start Wicd on backtrack it will show u error message like this.
wicd error message
then i found out the solution on backtrack Wiki.
1. Reboot your computer.
2. Before starting your Wicd, enter these shell commands
root@bt:~# dpkg-reconfigure wicd
root@bt:~# update-rc.d wicd defaults
now you will not see any error notification appear next time u start Wicd.