Node.js 为什么不是'；我从Heroku找到的NPM可以得到一个节点模块吗？

在本地，我可以运行：

npm install oscar@0.2.0

要安装此软件包，请执行以下操作：

您可以在该页面上看到当前版本为0.2.0

然而，当my package.json包含：

"dependencies": {
  "oscar": "~0.2.0",
  //...
}

。。。我推到Heroku，我得到这样的回答：

-----> Installing dependencies with npm
       npm ERR! Error: No compatible version found: oscar@'>=0.2.0- <0.3.0-'
       npm ERR! Valid install targets:
       npm ERR! ["0.1.0","0.1.1","0.1.2"]
       npm ERR!     at installTargetsError (/tmp/node-npm-Sezl/lib/cache.js:424:10)
       npm ERR!     at /tmp/node-npm-Sezl/lib/cache.js:406:17
       npm ERR!     at saved (/tmp/node-npm-Sezl/lib/utils/npm-registry-client/get.js:136:7)
       npm ERR!     at cb (/tmp/node-npm-Sezl/node_modules/graceful-fs/graceful-fs.js:36:9)
       npm ERR! Report this *entire* log at:
       npm ERR!     <http://github.com/isaacs/npm/issues>
       npm ERR! or email it to:
       npm ERR!     <npm-@googlegroups.com>
       npm ERR! 
       npm ERR! System Linux 2.6.32-348-ec2
       npm ERR! command "/tmp/node-node-yaOa/bin/node" "/tmp/node-npm-Sezl/cli.js" "install" "--production"
       npm ERR! cwd /tmp/build_13f8kjrsns2wh
       npm ERR! node -v v0.4.7
       npm ERR! npm -v 1.0.106
       npm ERR! 
       npm ERR! Additional logging details can be found in:
       npm ERR!     /tmp/build_13f8kjrsns2wh/npm-debug.log
       npm not ok
 !     Failed to install --production dependencies with npm
 !     Heroku push rejected, failed to compile Node.js app

To git@heroku.com:xxxxx-xxxxxx-nnnn.git
 ! [remote rejected] master -> master (pre-receive hook declined)

---

我做错了什么？为什么这个包的最新版本不可用？

哎呀，答案是我问题中的最后一个代码示例尚未提交，所以Heroku仍在使用旧版本的NPM和Node。提交该块并重新推送修复了它

"engines": {
  "node": "0.8.x",
  "npm":  "1.1.x"
},