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I think the problem is that I made Mac OS build on Windows. Here is an solution from the internet: 

I needed to make the actual executable in the .app folder, well, “executable”. Please try:

Open up a Terminal and navigate to your app folder:

cd <PATH_TO_YOUR_APP>/<APP_NAME>.app/Contents/MacOS/

This folder contains the actual executable file which Windows apparently didn’t make executable. Let’s add the executable flag:

chmod +x <APP_NAME>

Afterwards I could start the app.

Unfortunately, I never had a Mac OS and never used it so I don't know what else could be causing it.