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Hello, @MikaelFaujour I would, first of all, like to welcome you to the community. Then ask if you have messaged any of the people on the support team. I think that might work better than asking around Ask.
I have done a pip install flash and now the program starts. It is a good thing.
But I have a new problem, this is a web application and every request come back with a 404 error.
It is like if the request does not come to my code.
It comes after the nix upgrade.