刚接触 node 错误是什么意思呢》？

2016-02-14T04:51:28.315770+00:00 heroku[web.1]: Starting process with command npm start 2016-02-14T04:51:30.185494+00:00 app[web.1]: npm ERR! Linux 3.13.0-71-generic 2016-02-14T04:51:30.186030+00:00 app[web.1]: npm ERR! argv “/app/.heroku/node/bin/node” “/app/.herok u/node/bin/npm” "start" 2016-02-14T04:51:30.186331+00:00 app[web.1]: npm ERR! node v0.12.10 2016-02-14T04:51:30.186730+00:00 app[web.1]: npm ERR! npm v2.14.9 2016-02-14T04:51:30.187706+00:00 app[web.1]: 2016-02-14T04:51:30.187906+00:00 app[web.1]: npm ERR! missing script: start 2016-02-14T04:51:30.188045+00:00 app[web.1]: npm ERR! 2016-02-14T04:51:30.188154+00:00 app[web.1]: npm ERR! If you need help, you may report this error at : 2016-02-14T04:51:30.188266+00:00 app[web.1]: npm ERR! https://github.com/npm/npm/issues 2016-02-14T04:51:30.192614+00:00 app[web.1]: 2016-02-14T04:51:30.192909+00:00 app[web.1]: npm ERR! Please include the following file with any sup port request: 2016-02-14T04:51:30.193061+00:00 app[web.1]: npm ERR! /app/npm-debug.log 2016-02-14T04:51:30.740115+00:00 heroku[web.1]: Process exited with status 1 2016-02-14T04:51:30.733809+00:00 heroku[web.1]: State changed from starting to crashed 2016-02-14T04:51:30.734874+00:00 heroku[web.1]: State changed from crashed to starting 2016-02-14T04:51:32.361411+00:00 heroku[web.1]: Starting process with command npm start 2016-02-14T04:51:34.598788+00:00 app[web.1]: npm ERR! argv “/app/.heroku/node/bin/node” “/app/.herok u/node/bin/npm” "start" 2016-02-14T04:51:34.602083+00:00 app[web.1]: npm ERR! npm v2.14.9