Authentication problem with router

[#1]

Have just got a Cyclone Astro + 7" tablet and tried connecting to my router. Scanning on the tablet shows my router name and I am entering the correct password but keep getting "Authentication problem". Have tried searching for known problems with the tablet but can't find anything. Can someone point me in the right direction please?

[#2]

Have you checked if the router and the tablet are using the same security level (WEP, WPA-PSK or WPA2-PSK and are you using the wireless key

[#3]

Thanks for the heads up on security level. Changed on tablet and connected no problem. Cheers