[Konstantinos]

pawn Код:

stock PlayerName(playerid)
{
    new name[MAX_PLAYER_NAME];
    GetPlayerName(playerid, name, MAX_PLAYER_NAME);
    return name;
}

pawn Код:

// At the top, under '#include (s)'
#define COLOR_GREY 0xAFAFAFAA

About the other errors, don't copy paste code from other scripts and expecting them to work.
You should define so many things that I don't know where you got from.