In those two links it is written that gravitational energy does not exist. http://arxiv.org/abs/0908.3322 http://fqxi.org/community/forum/topic/1371 1. I read these articles, but how it is possible to say more clearly that gravitational energy does not exist? 2. What this means on an example of a Schwarchild black hole? It is a simpler example than other generalized derivation in the first link. 3. What this means on an example of a dense spherical mass,which is not black hole and it is not rotating? 4. Does exist still simpler example for visualisation and clarification of the above claims?