Mamoun: Where do you see the "unknown"? in your laptop the SSID name metnioned as "unknown"? or you are trying with some scanner's utility to find the AP?
As maldehne metnioned, if you are using the default AP group the created SSIDs should be members of that group by default. are you using other groups except the default one? if yes make sure to add all WLANs you want to broadcast under the same group (default group if you want) and try.
If It did not work then there could possibly be a problem with the code because under normal situations SSIDs should be broadcasted normally. just make sure that hte SSID is enabled and broadcasting.
You can also try move all your WLANs from the default group to some other new group and see if it works.
let us know what is happenign with you.
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