Canot Deploy Flask IN My server | Error 404

[Pythoniha]

Hello, thank you for your good project, no matter what I do, I can't use this project online on my host and I get a 404 error. This error is related to the use of Nginx and Gunicorn library, please help me. I will fix this error sooner.

more details :
The project is running on the local host and on the Windows 11 system without any problems, but when it is transferred to the server and the server specifications are Nginx and Gunicorn, it encounters a 404 error and there is no clear reason. There is no error, please help me to solve this problem

[xtekky]

change the config.json and set the port to 80