Null failed (exit code 139) after migrating from V7 to V9

Hi all,

I have impossibility to display the flow of a project after migrating my dataiku from V7 to V9.

I have doubts on my project because it navigated from V7 to V9 (where i added flow zones) to V7 again, and finally to V9 where i have my problem.
I know that this configuration management is chaotic but that is the real life in industry

My project is massive (~1000 datasets & ~1000 recipes).

Is there a way to solve this problem ?

thank you,

Regards.