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What does npm mean by 'Skipping failed optional dependency'?

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Latest version of node and npm causing problems in running karma. When I try to install karma-cli npm i -g karma karma-cli I get following warning:

npm WARN optional Skipping failed optional dependency /chokidar/fsevents:npm WARN notsup Not compatible with your operating system or architecture: fsevents@1.0.8npm WARN optional Skipping failed optional dependency /gulp-karma/chokidar/fsevents:npm WARN notsup Not compatible with your operating system or architecture: fsevents@0.2.1

And when I try to run karma test, I get following error:

"C:\Program Files\nodejs\node.exe""C:\Program Files (x86)\JetBrains\WebStorm 11.0.3\plugins\js-karma\js_reporter\karma-intellij\lib\intellijServer.js" --karmaPackageDir=C:\Users\xxx\AppData\Roaming\npm\node_modules\karma --configFile=C:\Users\xxx\Documents\project\karma.conf.js26 02 2016 11:24:07.871:WARN [plugin]: Cannot find plugin "karma-chrome-launcher".  Did you forget to install it ?  npm install karma-chrome-launcher --save-dev26 02 2016 11:24:07.877:WARN [plugin]: Cannot find plugin "karma-firefox-launcher".  Did you forget to install it ?  npm install karma-firefox-launcher --save-dev26 02 2016 11:24:07.878:WARN [plugin]: Cannot find plugin "karma-phantomjs-launcher".  Did you forget to install it ?  npm install karma-phantomjs-launcher --save-dev26 02 2016 11:24:07.879:WARN [plugin]: Cannot find plugin "karma-jasmine".  Did you forget to install it ?  npm install karma-jasmine --save-dev26 02 2016 11:24:07.880:WARN [plugin]: Cannot find plugin "karma-junit-reporter".  Did you forget to install it ?  npm install karma-junit-reporter --save-dev26 02 2016 11:24:07.885:WARN [plugin]: Cannot find plugin "karma-teamcity-reporter".  Did you forget to install it ?  npm install karma-teamcity-reporter --save-dev26 02 2016 11:24:07.887:WARN [plugin]: Cannot find plugin "karma-coverage".  Did you forget to install it ?  npm install karma-coverage --save-dev26 02 2016 11:24:07.888:WARN [plugin]: Cannot find plugin "karma-jasmine-html-reporter".  Did you forget to install it ?  npm install karma-jasmine-html-reporter --save-dev26 02 2016 11:24:07.889:WARN [plugin]: Cannot find plugin "karma-ng-html2js-preprocessor".  Did you forget to install it ?  npm install karma-ng-html2js-preprocessor --save-dev26 02 2016 11:24:07.890:WARN [plugin]: Cannot find plugin "karma-browserify".  Did you forget to install it ?  npm install karma-browserify --save-dev26 02 2016 11:24:07.893:WARN [preprocess]: Can not load "coverage", it is not registered!  Perhaps you are missing some plugin?26 02 2016 11:24:07.893:WARN [preprocess]: Can not load "ng-html2js", it is not registered!  Perhaps you are missing some plugin?26 02 2016 11:24:07.893:WARN [preprocess]: Can not load "browserify", it is not registered!  Perhaps you are missing some plugin?26 02 2016 11:24:07.901:WARN [reporter]: Can not load "coverage", it is not registered!  Perhaps you are missing some plugin?26 02 2016 11:24:07.901:WARN [reporter]: Can not load "junit", it is not registered!  Perhaps you are missing some plugin?C:\Users\xxx\AppData\Roaming\npm\node_modules\karma\node_modules\di\lib\injector.js:9      throw error('No provider for "'+ name +'"!');      ^Error: No provider for "framework:jasmine"! (Resolving: framework:jasmine)    at error (C:\Users\xxx\AppData\Roaming\npm\node_modules\karma\node_modules\di\lib\injector.js:22:12)    at Object.parent.get (C:\Users\xxx\AppData\Roaming\npm\node_modules\karma\node_modules\di\lib\injector.js:9:13)    at get (C:\Users\xxx\AppData\Roaming\npm\node_modules\karma\node_modules\di\lib\injector.js:54:19)    at C:\Users\xxx\AppData\Roaming\npm\node_modules\karma\lib\server.js:138:20    at Array.forEach (native)    at Server._start (C:\Users\xxx\AppData\Roaming\npm\node_modules\karma\lib\server.js:137:21)    at invoke (C:\Users\xxx\AppData\Roaming\npm\node_modules\karma\node_modules\di\lib\injector.js:75:15)    at Server.start (C:\Users\xxx\AppData\Roaming\npm\node_modules\karma\lib\server.js:102:18)    at Object.<anonymous> (C:\Program Files (x86)\JetBrains\WebStorm 11.0.3\plugins\js-karma\js_reporter\karma-intellij\lib\intellijServer.js:12:13)    at Module._compile (module.js:410:26)    at Object.Module._extensions..js (module.js:417:10)    at Module.load (module.js:344:32)    at Function.Module._load (module.js:301:12)    at Function.Module.runMain (module.js:442:10)    at startup (node.js:136:18)    at node.js:966:3Process finished with exit code 1

My configuration specification as follows:

Node version:v4.3.0
NPM version:3.7.3

I am not able to get karma version installed, I think it's not installed properly in my machine.


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