SCAR Code:
program New;
{.include SRL/SRL.scar}
var
x, y,i: integer;
procedure find;
begin
if FindObjCustom(x, y, ['pice'], [7559758, 12303300], 20) then begin
Wait(100 + random(100));
GetMousePos(X, Y);
Mouse(x, y, 0, 0, true); // Since you've already moved your mouse there.
end;
end;
begin
SetupSRL; // This is what you forgot. Allways call SetupSRL once.
ActivateClient;
Wait(300 + random(500));
Find;
end.
Drag the crosshairs over the client window and enjoy. 
Edit: If it fails to find it, try lowering the tolerance and pick more colors of the object you're trying to find.