I can't run this file in node.js

Im trying to run my first shttp-server with node.js, the problem is that I get on the terminal:

/sandbox/Node_js/server.js node server.js
-bash: /Users/yoniPacheko/WebstormProjects/sandbox/Node_js/server.js: Permission denied

this is the simple code:

var http = require ("http");

http.createServer(function(request, response){
   response.writeHead(200, {"Content-Type": 'text/plain'});
    response.write("hello world");
    response.end();
}).listen(8888);

Any idea why I don have rights to operate this call?