Following link was very helpful. I struggled with springer submission system. This system does not show any error it only says your pdf could not be built.
- I correctly though that EM needs flat file structure. I built my pdf file that way.
- After first error, I removed todo package since I thought that EM can not process it. I was correct.
- EM needs different file name for every submission like below. I did not guess this therefore I submitted in the same name 4 times.
My pdf is finally built. Lets go to next phase.