生命周期是什么意思?

这是我的应用程序代码:https://gist.github.com/samholmes/388ca4552c5936b52c5d

当我运行'blast-电子邮件'命令时，它会运行一段时间，直到很快崩溃并出现错误:

npm ERR! Linux 3.2.0-4-amd64
npm ERR! argv "/root/.nvm/versions/io.js/v1.6.1/bin/iojs" "/root/.nvm/versions/io.js/v1.6.1/bin/npm" "run" "live"
npm ERR! node v1.6.1
npm ERR! npm  v2.7.1
npm ERR! code ELIFECYCLE
npm ERR! emailer@0.0.0 live: `NODE_ENV=production node app.js`
npm ERR! Exit status 137
npm ERR! 
npm ERR! Failed at the emailer@0.0.0 live script 'NODE_ENV=production node app.js'.
npm ERR! This is most likely a problem with the emailer package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     NODE_ENV=production node app.js
npm ERR! You can get their info via:
npm ERR!     npm owner ls emailer
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR!     /apps/emailer/npm-debug.log

npm-debug.log文件也包含在gist中。

我正在寻找两个答案中的一个:生命周期是什么意思?(或)为什么我在我的应用程序代码中得到错误?