Can't launch the project on OSX

[ben-j69]

./serve.py
-bash: ./serve.py: Permission denied

sudo ./serve.py
sudo: ./serve.py: command not found

[albinoz]

chmod 755 ~/serve.py

But still not working on OSX 10.13.6 :
[StaticServe] Starting onelang.io static page server... Please use 127.0.0.1:8000 on Windows (using 'localhost' makes 1sec delay)
[StaticServe] Press Ctrl+C to exit.
[CompilerBackend] Starting TypeScript JSON-REPL...
[CompilerBackend] Starting Java JSON-REPL...
[CompilerBackend] Starting JavaScript JSON-REPL...
[CompilerBackend] Starting CSharp JSON-REPL...
Failed to start compiler CSharp: OSError(2, 'No such file or directory')
[CompilerBackend] Starting Python JSON-REPL...
[CompilerBackend] Starting PHP HTTP server...
[CompilerBackend] Starting Ruby JSON-REPL...
[CompilerBackend] Starting onelang.io CompilerBackend on port 11111...
[CompilerBackend] Press Ctrl+C to exit.
Erreur : impossible de trouver ou de charger la classe principale fastjavacompile.App
Causé par : java.lang.ClassNotFoundException: fastjavacompile.App
PHP 7.1.14 Development Server started at Wed Mar 28 12:52:26 2018
Listening on http://127.0.0.1:8003
Document root is ~/onelang/CompilerBackend/InMemoryCompilers/PHP
Press Ctrl-C to quit.