Open UEFN project stuck at 80%

Hi, i want to open my project to make an update on it but it’s stuck at 80% when i opening it. Yesterday i was able to open it, and i just add a new landscape with a custom material on it (it’s animated with a panner node) and today it’s stuck. Anyone can help me to solve it ?

More informations. My UEFN windows is locked and i need to force my computer to close it. Other UEFN projects loads correctly