1430. Path is empty or relative. So now you need to figure out why the path is empty.
I see in your code the path wire has a feedback node on it. Why? That is probably the cause because when you run your VI the feedback node is going to use the path from the previous run, which will be empty the first time your run it.
Likewise with the error wire. It has a feedback node for no apparent reason. (And it will probably keep stuff from running because the error from the first run will be remembered for all subsequent runs.)
Your inner most while loops have a True wired to the stop constant. That means they'll run one time. You can safely remove the while loops in there.
