[Larceny]

Your code is missing lots of variables.

pawn Code:

public OnPlayerDisconnect(playerid, reason)
{
    new Float:x;
    new Float:y;
    new Float:z;

    GetPlayerPos(playerid,x,y,z);
    skin = GetPlayerSkin(playerid);
    //WHERE skin, positionx, positiony, positionz is defined!? Also for the rest of the code,
    positionx = x;
    positiony = y;
    positionz = z;
    // ...
}

Edit: And, what are you trying to do exactly and what the errors you are getting?