[member]

What is the problem you are having?

your sscanf statement formatting was incorrect got the givelvl. it should be "ii" not "iz", though i think this may not be your problem.
https://sampwiki.blast.hk/wiki/Fast_Commands#Data_types

pawn Код:

dcmd_setadmin(playerid,params[])
{
    if(AdminLvL[playerid] >= 5 || IsPlayerAdmin(playerid))
    {
        new giveplayerid, givelvl;
        if(!sscanf(params,"ii", giveplayerid, givelvl))
        {
            if(!IsPlayerConnected(giveplayerid))
            {
                new Stringy[128];
                format(Stringy, sizeof(Stringy), "ID (%d) Is not an active player", giveplayerid);
                SendClientMessage(playerid, COLOR_RED, Stringy);
                return 1;
            }
            new Stringy[128];
            format(Stringy, sizeof(Stringy), "You gave ID(%d) LVL %d Admin", giveplayerid, givelvl);
            SendClientMessage(playerid, COLOR_RED, Stringy);
            format(Stringy, sizeof(Stringy), "You are now lvl %d Admin", givelvl);
            SendClientMessage(giveplayerid, COLOR_RED, Stringy);
            AdminLvL[giveplayerid] = givelvl;
            return 1;
        }
        else SendClientMessage(playerid,COLOR_RED,"Usage: /setadmin [id] [lvl]");
    }
    else SendClientMessage(playerid,COLOR_RED,"You need to be admin level 5+ or RCON Admin to do that!");
}