No idea if this is the right place for this but im assuming so as its the App Development Course

Im having issues with this game and the squash game, the main issue seems to be that the "Vector3d.java" Class in "com.train2game.Libraries" seems to be creating an error but i cant get to grips with whats wrong with it.

Anyone else having this issue?

(i also had an issue like this on the Squash game that i never resolved)

Thanks
Adam