warning driver for wlan0 recomends version of 18 of wireless extension, but has been complied with 16 therefore some driver features may not be availalbe
Dunno for this error, but as its only a warning, it probably won't interfere the working. Although It might be possible you need to reconfigure the wireless-tools (iwconfig) to match your network, a in channel, encryption, ESSID, etc etc ... Match with the settings in your accespoint.
Also a good place to start is to see if you have gotten an ip from your accespoint.

Code:
#ifconfig
Cheers.