Ok, i think i’m going to try to find the blueprint first because all my BluePrints are empty.
I use them as prototype only and then write the code in C++.
Maybe i forgot to delete some node and it is causing the problem.
If it was the problem i will post here. Maybe it help to someone else.
Otherwise, i will migrate my projet to a new one.
Thank you so much for you help @FrostyJas !!