Looks like you are trying to add a constraint with a symbol/name that already exists.
I finally fixed the problem thanks to a workaround. The alter works ok on my dev machine while it fails on the host. I didn't find the reason but I succeed to make it working by exporting, migrating on my dev machine and reimporting.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.