Karma cannot find module 'optimist'

I am trying to install angular phone cat app and run the test cases with karma test runner. I have node v0.10.33 installed. and I have installed karma globally. Now, i am trying to run the test cases with 'npm test' and I get following error:

module.js:340
    throw err;
          ^
Error: Cannot find module 'optimist'
    at Function.Module._resolveFilename (module.js:338:15)
    at Function.Module._load (module.js:280:25)
    at Module.require (module.js:364:17)
    at require (module.js:380:17)
    at Object.<anonymous> (C:\me\angular-phonecat\node_modules\karma\lib\cli.j
s:2:16)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Module.require (module.js:364:17)

Any idea ? I thought may be karma is not initialized right and I tried to run 'karma init' but same error again.

Update-----

On running 'npm install' i get following errors:

npm WARN unmet dependency C:\me\angular-phonecat\node_modules\karma requires s
ocket.io@'~0.9.13' but will load
npm WARN unmet dependency C:\me\angular-phonecat\node_modules\socket.io,
npm WARN unmet dependency which is version 1.2.0
npm WARN unmet dependency C:\me\angular-phonecat\node_modules\karma requires g
lob@'~3.2.7' but will load
npm WARN unmet dependency C:\me\angular-phonecat\node_modules\glob,
npm WARN unmet dependency which is version 4.1.4
npm WARN unmet dependency C:\me\angular-phonecat\node_modules\karma requires m
inimatch@'~0.2' but will load
npm WARN unmet dependency C:\me\angular-phonecat\node_modules\minimatch,
npm WARN unmet dependency which is version 1.0.0
npm WARN unmet dependency C:\me\angular-phonecat\node_modules\karma requires u
seragent@'~2.0.4' but will load
npm WARN unmet dependency C:\me\angular-phonecat\node_modules\useragent,
npm WARN unmet dependency which is version 2.1.2
npm WARN unmet dependency C:\me\angular-phonecat\node_modules\karma requires c
onnect@'~2.12.0' but will load
npm WARN unmet dependency C:\me\angular-phonecat\node_modules\connect,
npm WARN unmet dependency which is version 3.3.3
npm WARN unmet dependency C:\me\angular-phonecat\node_modules\bower\node_modul
es\handlebars requires optimist@'~0.3' but will load
npm WARN unmet dependency C:\me\angular-phonecat\node_modules\optimist,
npm WARN unmet dependency which is version 0.6.1
npm WARN unmet dependency C:\me\angular-phonecat\node_modules\bower\node_modul
es\bower-registry-client\node_modules\request\node_modules\form-data requires as
ync@'~0.9.0' but will load
npm WARN unmet dependency C:\me\angular-phonecat\node_modules\bower\node_modul
es\bower-registry-client\node_modules\async,
npm WARN unmet dependency which is version 0.2.10
npm WARN unmet dependency C:\me\angular-phonecat\node_modules\bower\node_modul
es\insight\node_modules\inquirer\node_modules\cli-color\node_modules\d requires
es5-ext@'~0.10.2' but will load
npm WARN unmet dependency undefined,
npm WARN unmet dependency which is version undefined
npm WARN unmet dependency C:\me\angular-phonecat\node_modules\bower\node_modul
es\insight\node_modules\inquirer\node_modules\cli-color\node_modules\timers-ext
requires es5-ext@'~0.10.2' but will load

Solution

Try do next steps before run npm install

remove folder node_modules from your project
run npm cache clean
run npm install