Bad login. please help.

[SearchMan]

I am a new player at this server (actually i have never played) bcos i keep getting this error:
Connection lost: failed to login: bad login. i know there is another post about this but i didn't get much info on it.
i get this with most servers exept a few, i would like to play on this server cos it looks cool
thanks btw, is this server cracked?

[5OO]

You have to buy the game to play on smp.opticraft.net, if you cant buy the game then you can play on opticrafts classic server.

[Xeadin]

If you're trying to connect to the SMP server using a cracked client, it will not work (it is NOT a 'cracked' server). You need to buy the game in order to use our SMP services.

[SearchMan]

ok then bye