启动服务器时找不到模块'express-stormpath‘

Question

当我尝试运行node server.js (在没有超级用户或超级用户身份的普通终端中)时，我得到这个错误：

alphaunlimitedg@AUNs-PC:~/my-webapp$ node server.js
module.js:442
    throw err;
    ^

Error: Cannot find module 'express-stormpath'
    at Function.Module._resolveFilename (module.js:440:15)
    at Function.Module._load (module.js:388:25)
    at Module.require (module.js:468:17)
    at require (internal/module.js:20:19)
    at Object.<anonymous> (/home/alphaunlimitedg/my-webapp/server.js:2:17)
    at Module._compile (module.js:541:32)
    at Object.Module._extensions..js (module.js:550:10)
    at Module.load (module.js:458:32)
    at tryModuleLoad (module.js:417:12)
    at Function.Module._load (module.js:409:3)
alphaunlimitedg@AUNs-PC:~/my-webapp$

我已经使用以下命令在根用户、超级用户和普通用户中安装了express包：npm install express

它工作了，没有给出任何错误！但它仍然显示上面的错误。有什么办法可以解决这个问题吗？

PS:这是我遵循的过程，如下所示：

alphaunlimitedg@AUNs-PC:~$ npm install express
/home/alphaunlimitedg
└─┬ express@4.14.0 
  ├─┬ accepts@1.3.3 
  │ ├─┬ mime-types@2.1.11 
  │ │ └── mime-db@1.23.0 
  │ └── negotiator@0.6.1 
  ├── array-flatten@1.1.1 
  ├── content-disposition@0.5.1 
  ├── content-type@1.0.2 
  ├── cookie@0.3.1 
  ├── cookie-signature@1.0.6 
  ├─┬ debug@2.2.0 
  │ └── ms@0.7.1 
  ├── depd@1.1.0 
  ├── encodeurl@1.0.1 
  ├── escape-html@1.0.3 
  ├── etag@1.7.0 
  ├─┬ finalhandler@0.5.0 
  │ ├── statuses@1.3.0 
  │ └── unpipe@1.0.0 
  ├── fresh@0.3.0 
  ├── merge-descriptors@1.0.1 
  ├── methods@1.1.2 
  ├─┬ on-finished@2.3.0 
  │ └── ee-first@1.1.1 
  ├── parseurl@1.3.1 
  ├── path-to-regexp@0.1.7 
  ├─┬ proxy-addr@1.1.2 
  │ ├── forwarded@0.1.0 
  │ └── ipaddr.js@1.1.1 
  ├── qs@6.2.0 
  ├── range-parser@1.2.0 
  ├─┬ send@0.14.1 
  │ ├── destroy@1.0.4 
  │ ├─┬ http-errors@1.5.0 
  │ │ ├── inherits@2.0.1 
  │ │ └── setprototypeof@1.0.1 
  │ └── mime@1.3.4 
  ├── serve-static@1.11.1 
  ├─┬ type-is@1.6.13 
  │ └── media-typer@0.3.0 
  ├── utils-merge@1.0.0 
  └── vary@1.1.0 

npm WARN enoent ENOENT: no such file or directory, open '/home/alphaunlimitedg/package.json'
npm WARN alphaunlimitedg No description
npm WARN alphaunlimitedg No repository field.
npm WARN alphaunlimitedg No README data
npm WARN alphaunlimitedg No license field.
alphaunlimitedg@AUNs-PC:~$ express --help
The program 'express' is currently not installed. You can install it by typing:
sudo apt install node-express-generator
alphaunlimitedg@AUNs-PC:~$ sudo apt install node-express-generator
[sudo] password for alphaunlimitedg: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages were automatically installed and are no longer required:
  gyp javascript-common libjs-inherits libjs-jquery libjs-node-uuid
  libjs-underscore libssl-dev libssl-doc libuv1 libuv1-dev zlib1g-dev
Use 'sudo apt autoremove' to remove them.
The following additional packages will be installed:
  node-accepts node-buffer-crc32 node-commander node-cookie
  node-cookie-signature node-crc node-debug node-depd node-escape-html
  node-etag node-express node-fresh node-media-typer node-merge-descriptors
  node-methods node-mime node-mime-types node-mkdirp node-negotiator
  node-on-finished node-parseurl node-path-to-regexp node-qs node-range-parser
  node-send node-serve-static node-type-is node-utils-merge
The following NEW packages will be installed:
  node-accepts node-buffer-crc32 node-commander node-cookie
  node-cookie-signature node-crc node-debug node-depd node-escape-html
  node-etag node-express node-express-generator node-fresh node-media-typer
  node-merge-descriptors node-methods node-mime node-mime-types node-mkdirp
  node-negotiator node-on-finished node-parseurl node-path-to-regexp node-qs
  node-range-parser node-send node-serve-static node-type-is node-utils-merge
0 upgraded, 29 newly installed, 0 to remove and 11 not upgraded.
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Get:26 http://nl.archive.ubuntu.com/ubuntu xenial/universe amd64 node-express-generator all 4.0.0-2 [7478 B]
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alphaunlimitedg@AUNs-PC:~$ cd my-webapp
alphaunlimitedg@AUNs-PC:~/my-webapp$ node server.js
module.js:442
    throw err;
    ^

Error: Cannot find module 'express-stormpath'
    at Function.Module._resolveFilename (module.js:440:15)
    at Function.Module._load (module.js:388:25)
    at Module.require (module.js:468:17)
    at require (internal/module.js:20:19)
    at Object.<anonymous> (/home/alphaunlimitedg/my-webapp/server.js:2:17)
    at Module._compile (module.js:541:32)
    at Object.Module._extensions..js (module.js:550:10)
    at Module.load (module.js:458:32)
    at tryModuleLoad (module.js:417:12)
    at Function.Module._load (module.js:409:3)
alphaunlimitedg@AUNs-PC:~/my-webapp$ sudo apt-get install node-express
Reading package lists... Done
Building dependency tree       
Reading state information... Done
node-express is already the newest version (4.1.1~dfsg-1).
node-express set to manually installed.
The following packages were automatically installed and are no longer required:
  gyp javascript-common libjs-inherits libjs-jquery libjs-node-uuid
  libjs-underscore libssl-dev libssl-doc libuv1 libuv1-dev zlib1g-dev
Use 'sudo apt autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 11 not upgraded.
alphaunlimitedg@AUNs-PC:~/my-webapp$ node server.js
module.js:442
    throw err;
    ^

Error: Cannot find module 'express-stormpath'
    at Function.Module._resolveFilename (module.js:440:15)
    at Function.Module._load (module.js:388:25)
    at Module.require (module.js:468:17)
    at require (internal/module.js:20:19)
    at Object.<anonymous> (/home/alphaunlimitedg/my-webapp/server.js:2:17)
    at Module._compile (module.js:541:32)
    at Object.Module._extensions..js (module.js:550:10)
    at Module.load (module.js:458:32)
    at tryModuleLoad (module.js:417:12)
    at Function.Module._load (module.js:409:3)
alphaunlimitedg@AUNs-PC:~/my-webapp$