@PitaJ that works ! Thanks very much.
I moved some categories into another one
If I remembered well, in child 2, I did something like "copy he parameters of the child3"
Now I can't see Parent and children. (Bu I see titles containers in children in home).
When I clic on a title, I have no error and cant reach it.
I really don't know how to debug it or get back my datas. There is no error in logs.
Some tips would be precious to me...