[newbie scripter]

i think there is an mistake in the end.

pawn Код:

if(!IsPlayerAdmin(playerid)) return SendClientMessage(playerid, RED, "(([!]You cannot access this command as you're not admin!))");

if(IsPlayerAdmin(playerid))
{
     Command here...
}

you forgot to add '!' . which checkes whether he isn't an admin

Anyway Good Job