[Lordzy]

Try this

pawn Код:

COMMAND:setskin(playerid,params[])
{
new skin;
if(sscanf(params,"i",skin)) return SendClientMessage(playerid, 0xFF0000, "Usage: /setskin <skinid>");
if(skin < 0 || skin > 299) return SendClientMessage(playerid, 0xFF0000, "SkinIDs between 0 and 299!");
SetPlayerSkin(playerid,skin);
return 1;
}

Or this

pawn Код:

COMMAND:setskin(playerid,params[])
{
new skin;
if(sscanf(params,"i",skin)) return NoSuccess(playerid,"Usage: /setskin <skinid>");
if(skin < 0 || skin > 299) return NoSuccess(playerid,"SkinIDs between 0 and 299!");

SetPlayerSkin(playerid,skin);
return 1;
}