subscript error when their shouldnt be

[ecstatic]

Do
        $MonsterFind = PixelSearch(14, 35, 800, 630, $Monsters)
        CHECKHEALTH()
        If Not @error Then
            MouseClick("right", $MonsterFind[0], $MonsterFind[1])
        EndIf
    Until @error <> 0

==> Subscript used with non-Array variable.:
MouseClick("right", $MonsterFind[0], $MonsterFind[1])
MouseClick("right", $MonsterFind^ ERROR

Now why is it doing that?