所以我正在尝试安装Express Application Generator for Express。它继续失败，并表示访问被拒绝。之前其他应用已经发生这种情况。我注意到我可以安装一些像express这样的npm模块，但不能像Application Generator那样安装其他模块。
以下是错误报告：
0 info it worked if it ends with ok
1 verbose cli [ '/usr/local/bin/node',
1 verbose cli '/usr/local/bin/npm',
1 verbose cli 'install',
1 verbose cli 'express-generator',
1 verbose cli '-g' ]
2 info using npm@2.15.8
3 info using node@v4.4.7
4 verbose install initial load of /usr/local/lib/package.json
5 verbose readDependencies loading dependencies from /usr/local/lib/package.json
6 silly cache add args [ 'express-generator', null ]
7 verbose cache add spec express-generator
8 silly cache add parsed spec Result {
8 silly cache add raw: 'express-generator',
8 silly cache add scope: null,
8 silly cache add name: 'express-generator',
8 silly cache add rawSpec: '',
8 silly cache add spec: 'latest',
8 silly cache add type: 'tag' }
9 silly addNamed express-generator@latest
10 verbose addNamed "latest" is being treated as a dist-tag for express-generator
11 info addNameTag [ 'express-generator', 'latest' ]
12 silly mapToRegistry name express-generator
13 silly mapToRegistry using default registry
14 silly mapToRegistry registry https://registry.npmjs.org/
15 silly mapToRegistry data Result {
15 silly mapToRegistry raw: 'express-generator',
15 silly mapToRegistry scope: null,
15 silly mapToRegistry name: 'express-generator',
15 silly mapToRegistry rawSpec: '',
15 silly mapToRegistry spec: 'latest',
15 silly mapToRegistry type: 'tag' }
16 silly mapToRegistry uri https://registry.npmjs.org/express-generator
17 verbose addNameTag registry:https://registry.npmjs.org/express-generator not in flight; fetching
18 verbose request uri https://registry.npmjs.org/express-generator
19 verbose request no auth needed
20 info attempt registry request try #1 at 12:52:28 PM
21 verbose request id 4949452f6f27259c
22 verbose etag "8A1N6JIYFXC8B1D30NIZQQ2EO"
23 http request GET https://registry.npmjs.org/express-generator
24 http 304 https://registry.npmjs.org/express-generator
25 verbose headers { date: 'Wed, 03 Aug 2016 16:52:28 GMT',
25 verbose headers via: '1.1 varnish',
25 verbose headers 'cache-control': 'max-age=300',
25 verbose headers etag: '"8A1N6JIYFXC8B1D30NIZQQ2EO"',
25 verbose headers age: '95',
25 verbose headers connection: 'keep-alive',
25 verbose headers 'x-served-by': 'cache-jfk1043-JFK',
25 verbose headers 'x-cache': 'HIT',
25 verbose headers 'x-cache-hits': '1',
25 verbose headers 'x-timer': 'S1470243148.471897,VS0,VE0',
25 verbose headers vary: 'Accept-Encoding' }
26 silly get cb [ 304,
26 silly get { date: 'Wed, 03 Aug 2016 16:52:28 GMT',
26 silly get via: '1.1 varnish',
26 silly get 'cache-control': 'max-age=300',
26 silly get etag: '"8A1N6JIYFXC8B1D30NIZQQ2EO"',
26 silly get age: '95',
26 silly get connection: 'keep-alive',
26 silly get 'x-served-by': 'cache-jfk1043-JFK',
26 silly get 'x-cache': 'HIT',
26 silly get 'x-cache-hits': '1',
26 silly get 'x-timer': 'S1470243148.471897,VS0,VE0',
26 silly get vary: 'Accept-Encoding' } ]
27 verbose etag https://registry.npmjs.org/express-generator from cache
28 verbose get saving express-generator to /Users/tinocaer/.npm/registry.npmjs.org/express-generator/.cache.json
29 verbose correctMkdir /Users/tinocaer/.npm correctMkdir not in flight; initializing
30 silly addNameTag next cb for express-generator with tag latest
31 silly addNamed express-generator@4.13.4
32 verbose addNamed "4.13.4" is a plain semver version for express-generator
33 silly cache afterAdd express-generator@4.13.4
34 verbose afterAdd /Users/tinocaer/.npm/express-generator/4.13.4/package/package.json not in flight; writing
35 verbose correctMkdir /Users/tinocaer/.npm correctMkdir not in flight; initializing
36 verbose afterAdd /Users/tinocaer/.npm/express-generator/4.13.4/package/package.json written
37 silly install resolved [ { name: 'express-generator',
37 silly install resolved description: 'Express\' application generator',
37 silly install resolved version: '4.13.4',
37 silly install resolved author: { name: 'TJ Holowaychuk', email: 'tj@vision-media.ca' },
37 silly install resolved contributors: [ [Object], [Object], [Object], [Object], [Object], [Object] ],
37 silly install resolved keywords:
37 silly install resolved [ 'express',
37 silly install resolved 'framework',
37 silly install resolved 'sinatra',
37 silly install resolved 'web',
37 silly install resolved 'rest',
37 silly install resolved 'restful',
37 silly install resolved 'router',
37 silly install resolved 'app',
37 silly install resolved 'api' ],
37 silly install resolved repository:
37 silly install resolved { type: 'git',
37 silly install resolved url: 'git+https://github.com/expressjs/generator.git' },
37 silly install resolved license: 'MIT',
37 silly install resolved dependencies: { commander: '2.7.1', mkdirp: '0.5.1', 'sorted-object': '2.0.0' },
37 silly install resolved main: 'bin/express',
37 silly install resolved preferGlobal: true,
37 silly install resolved bin: { express: './bin/express' },
37 silly install resolved devDependencies: { mocha: '2.4.5', rimraf: '2.5.2', supertest: '1.2.0' },
37 silly install resolved engines: { node: '>= 0.10' },
37 silly install resolved files: [ 'LICENSE', 'bin/', 'templates/' ],
37 silly install resolved scripts:
37 silly install resolved { test: 'mocha --reporter spec --bail --check-leaks test/',
37 silly install resolved 'test-ci': 'mocha --reporter spec --check-leaks test/' },
37 silly install resolved gitHead: 'f7b1543a297425f541f0b18c3312105c403a660f',
37 silly install resolved bugs: { url: 'https://github.com/expressjs/generator/issues' },
37 silly install resolved homepage: 'https://github.com/expressjs/generator',
37 silly install resolved _id: 'express-generator@4.13.4',
37 silly install resolved _shasum: '3abec2e5e7b548820075024954ff7fa6a447e5eb',
37 silly install resolved _from: 'express-generator@latest',
37 silly install resolved _npmVersion: '1.4.28',
37 silly install resolved _npmUser: { name: 'dougwilson', email: 'doug@somethingdoug.com' },
37 silly install resolved maintainers: [ [Object] ],
37 silly install resolved dist:
37 silly install resolved { shasum: '3abec2e5e7b548820075024954ff7fa6a447e5eb',
37 silly install resolved tarball: 'https://registry.npmjs.org/express-generator/-/express-generator-4.13.4.tgz' },
37 silly install resolved _npmOperationalInternal:
37 silly install resolved { host: 'packages-16-east.internal.npmjs.com',
37 silly install resolved tmp: 'tmp/express-generator-4.13.4.tgz_1466223574112_0.6206904440186918' },
37 silly install resolved directories: {},
37 silly install resolved _resolved: 'https://registry.npmjs.org/express-generator/-/express-generator-4.13.4.tgz',
37 silly install resolved readme: 'ERROR: No README data found!' } ]
38 info install express-generator@4.13.4 into /usr/local/lib
39 info installOne express-generator@4.13.4
40 verbose installOne of express-generator to /usr/local/lib not in flight; installing
41 verbose correctMkdir /Users/tinocaer/.npm/_locks correctMkdir not in flight; initializing
42 verbose lock using /Users/tinocaer/.npm/_locks/express-generator-d3cc1706f4adef09.lock for /usr/local/lib/node_modules/express-generator
43 silly install write writing express-generator 4.13.4 to /usr/local/lib/node_modules/express-generator
44 verbose unbuild lib/node_modules/express-generator
45 silly gentlyRm /usr/local/lib/node_modules/express-generator is being purged from base /usr/local
46 verbose gentlyRm don't care about contents; nuking /usr/local/lib/node_modules/express-generator
47 verbose tar unpack /Users/tinocaer/.npm/express-generator/4.13.4/package.tgz
48 verbose tar unpacking to /usr/local/lib/node_modules/express-generator
49 silly gentlyRm /usr/local/lib/node_modules/express-generator is being purged
50 verbose gentlyRm don't care about contents; nuking /usr/local/lib/node_modules/express-generator
51 silly gunzTarPerm modes [ '755', '644' ]
52 error tar.unpack untar error /Users/tinocaer/.npm/express-generator/4.13.4/package.tgz
53 verbose unlock done using /Users/tinocaer/.npm/_locks/express-generator-d3cc1706f4adef09.lock for /usr/local/lib/node_modules/express-generator
54 verbose fstream_path /usr/local/lib/node_modules/express-generator
55 verbose fstream_type Directory
56 verbose fstream_class DirWriter
57 verbose stack Error: EACCES: permission denied, mkdir '/usr/local/lib/node_modules/express-generator'
57 verbose stack at Error (native)
58 verbose fstream_stack /usr/local/lib/node_modules/npm/node_modules/fstream/lib/dir-writer.js:35:25
58 verbose fstream_stack /usr/local/lib/node_modules/npm/node_modules/mkdirp/index.js:47:53
58 verbose fstream_stack FSReqWrap.oncomplete (fs.js:82:15)
59 verbose cwd /Users/tinocaer
60 error Darwin 15.6.0
61 error argv "/usr/local/bin/node" "/usr/local/bin/npm" "install" "express-generator" "-g"
62 error node v4.4.7
63 error npm v2.15.8
64 error path /usr/local/lib/node_modules/express-generator
65 error code EACCES
66 error errno -13
67 error syscall mkdir
68 error Error: EACCES: permission denied, mkdir '/usr/local/lib/node_modules/express-generator'
68 error at Error (native)
68 error { [Error: EACCES: permission denied, mkdir '/usr/local/lib/node_modules/express-generator']
68 error errno: -13,
68 error code: 'EACCES',
68 error syscall: 'mkdir',
68 error path: '/usr/local/lib/node_modules/express-generator',
68 error fstream_type: 'Directory',
68 error fstream_path: '/usr/local/lib/node_modules/express-generator',
68 error fstream_class: 'DirWriter',
68 error fstream_stack:
68 error [ '/usr/local/lib/node_modules/npm/node_modules/fstream/lib/dir-writer.js:35:25',
68 error '/usr/local/lib/node_modules/npm/node_modules/mkdirp/index.js:47:53',
68 error 'FSReqWrap.oncomplete (fs.js:82:15)' ] }
69 error Please try running this command again as root/Administrator.
70 verbose exit [ -13, true ]
71 verbose unbuild lib/node_modules/express-generator
72 silly gentlyRm /usr/local/lib/node_modules/express-generator is being purged from base /usr/local
73 verbose gentlyRm don't care about contents; nuking /usr/local/lib/node_modules/express-generator
感谢您的帮助。