[Deat_Itself]

Код:

if (strcmp("/command", cmdtext, true, 10) == 0)
	{
	if(GetPlayerSkin(playerid) == 288) //change 288 to your skin
	{
	SendClientMessage(playerid,0x33AA33AA,"Replace this sendclient message to whatever you need");
	}
	else {
	SendClientMessage(playerid, 0x33AA33AA, "You are not a cop");
	}
	return 1;
	}

remove one bracket after return 1;