Page Unavailable - Server Unavailable Error 503

DEBUG: Starting child process with 'node server/app.js'
DEBUG: Program node server/app.js exited with code 8
    at Function.Module.runMain (module.js:497:10)
    at Function.Module._load (module.js:312:12)
    at Module.load (module.js:356:32)
    at Object.Module._extensions..js (module.js:474:10)
    at Module._compile (module.js:456:26)
    at Object.<anonymous> (/var/lib/openshift/agileprojectdash-zo8mv73ipsn1-1/app-root/runtime/repo/server/app.js:7:22)
    at require (module.js:380:17)
    at Module.require (module.js:364:17)
    at Function.Module._load (module.js:280:25)
    at Function.Module._resolveFilename (module.js:338:15)
Error: Cannot find module 'babel-runtime/core-js/set-immediate'
          ^
    throw err;
module.js:340

My application is Mean stack app generated using yo Angular fullstack. I have transferred all the build files to the gear repo. after doing Git push, now when i hit the url, i get the error as Server Unavailable Error 503. is there any problem with my code or with server availability?

via Aalokit S. Chhabra