If you like the error, why would you get rid of it?
I'm pretty sure theres a function getComponentFromPath or something. It's been a while since I used vision, but fairly confident that getComponent can only be supplied with a single component and you have to stack them, although that error suggests it should be an integer...
Containers (like a root container) have a .getComponent() method that takes the string name of a single component. Window objects do not have this method, just the native Swing method that takes an integer.
But, window objects do have the .getComponentForPath() method that takes a complete path string. You are mixing the two.