I would not have wanted to write this. In fact, I am so sorry of the fact that many times some questions are not considered as they are too stupid.
My question Scalar curvature is $0$ for Schwarzschild solution has been closed soon after writing and submitting it. I have not understood why...in effect I have tried to show my work and in the comments I have understood that my work is wrong.
So my question is: does failing a work imply a question closed? I would have hoped that an attempt of work could have been appreciated and someone could tell me how solve my mistakes.