Error Code : 51100 [ HELP !!!]

[Dakani]

Hello, I need some help with my NDSLite.

The error :

Unable to connect to the acces point.
Confirm the correct WEP key has been entered .
then turn your system iff and on again.
For help, visit support.nintendo.com.

I entered the right WEP Key of my Thomson Gateway but it still says Wrong Wep ?!
i also restarted my NDSL System and it\s still not working .

please help me !

( I also tried nintendo Foum, didn\t help )