[Biesmen]

Those else statements aren't used in a correct way, it won't work.
Thanks for trying.

@Drift Hunter
-Face palm-

pawn Код:

CMD:warn(playerid, params[])
{
    new giveplayerid, reason[128];
    if(PlayerInfo[playerid][pAdmin] > 0)
    {
        if(sscanf(params, "us[128]", giveplayerid, reason)) return SendClientMessage(playerid, COLOR_RED, "Usage: /warn [Playerid/PartOfName] [Reason]");
        if(!IsPlayerConnected(giveplayerid)) return SendClientMessage(playerid, COLOR_RED, "This player is not connected.");
        if(PlayerInfo[giveplayerid][pAdmin] >= PlayerInfo[playerid][pAdmin]) return SendClientMessage(playerid, COLOR_RED, "You can't warn this player.");
        MaxWarnings[giveplayerid]++;
        format(reason, sizeof(reason), "Admin {FF4500}%s(%i){FF0000} has warned {FF4500}%s(%i){FF0000} for: {FF4500}%s {FF0000}(%i/3)", PlayerName(playerid), playerid, PlayerName(giveplayerid), giveplayerid, reason, MaxWarnings[giveplayerid]);
        SendClientMessageToAll(COLOR_RED2, reason);
        if(MaxWarnings[giveplayerid] == 3)
        {
            SendClientMessage(playerid, COLOR_GREY, "You've been kicked for reaching the maximum amount of warnings");
            Kick(giveplayerid);
        }
    }

That's the full code.