I see you added my isInArea there, but actually some months ago I said they could add few of my functions there, which they did. But they simply renamed it to isInRange, which means that you've got 2 functions doing the same job
http://otland.net/f55/check-o-5699/
They added them, but renamed the last
So you could remove it or simply add it to the compat.lua ^.-