heroku apps not running forever script.js - heroku

Question

I have a heroku app created on my local system and pushed it to heroku then i ran
heroku run node_modules/forever/bin/forever start server.js
and i got this response -
warn: --minUptime not set. Defaulting to: 1000ms
warn: --spinSleepTime not set. Your script will exit if it does not stay up for at least 1000ms
info: Forever processing file: server.js
and after that if i run
heroku run node_modules/forever/bin/forever list
I got -
Running `node_modules/forever/bin/forever list` attached to terminal... up, run.5132
info: No forever processes running
and the heroku logs here have -
Starting process with command `node_modules/forever/bin/forever start server.js` by harshitladdha93#gmail.com
2014-07-05T17:24:54.833343+00:00 heroku[run.5098]: State changed from starting to up
2014-07-05T17:24:58.695683+00:00 heroku[run.5098]: State changed from up to complete
2014-07-05T17:24:58.689043+00:00 heroku[run.5098]: Process exited with status 0
this, and my server.js has -
var async = require('async');
var shell = require('shelljs');
async.parallel([
async.apply(shell.exec, './collect1.sh'),
async.apply(shell.exec, './collect2.sh'),
async.apply(shell.exec, './collect3.sh'),
async.apply(shell.exec, './collect4.sh'),
async.apply(shell.exec, './collect5.sh'),
async.apply(shell.exec, './mi2.sh'),
],
function (err, results) {
console.log(results);
});
and these shell scripts are long executing files with huge amount of delays but the logs say that the state from up to complete, but I don't understand why as in my local system it creates more processes and sleep states and it runs fine
so, heroku doesn't allow this or I am making some mistake here.