Vision code in separate class?

[CarrotBlasphemy]

I downloaded the sample vision code project and copied the main file into my preexisting project. Whenever I attempt to create a new `VisionCode vision=new VisionCode();` and try to run it, it says "network tables has already been initialized" and the program halts. Is there a way to cleanly keep the vision code in a separate file and call it from my main one? This is my first year as programmer and our team's first year trying vision code

Thanks!