问题 I've cloned the meanjs repo and deployed to heroku but application won't run and shows the following error: Application error An error occurred in the application and your page could not be served. If you are the application owner, check your logs for details. Checking the logs, it says: 17-04-18T03:16:50.720375+00:00 app[web.1]: 2017-04-18T03:16:50.730925+00:00 app[web.1]: sh: 1: gulp: not found 2017-04-18T03:16:50.742737+00:00 app[web.1]: npm ERR! file sh 2017-04-18T03:16:50.743150+00:00