Met karma loading related error when doing npm run build ...

[xeoshow]

Hi,
How to resolve below error? when doing npm run dev, it is normal ...
Thanks a lot!

--
D:\gitrepository\vue-touch-keyboard>npm run build

[email protected] prebuild D:\gitrepository\vue-touch-keyboard
npm run test

[email protected] pretest D:\gitrepository\vue-touch-keyboard
npm run lint

[email protected] lint D:\gitrepository\vue-touch-keyboard
eslint --ext=.js,.vue src test/unit/specs

[email protected] test D:\gitrepository\vue-touch-keyboard
npm run unit

[email protected] unit D:\gitrepository\vue-touch-keyboard
karma start test/unit/karma.conf.js

14 06 2017 13:19:07.724:ERROR [plugin]: Error during loading "D:\gitrepository\vue-touch-keyboard\node_modules/karma-phantomjs-launcher" plugin:
Path must be a string. Received null
14 06 2017 13:19:12.678:INFO [karma]: Karma v1.3.0 server started at http://localhost:9876/
14 06 2017 13:19:12.683:INFO [launcher]: Launching browser PhantomJS with unlimited concurrency
14 06 2017 13:19:12.687:ERROR [karma]: Found 1 load error

npm ERR! Windows_NT 6.1.7601
npm ERR! argv "C:\nodejs\node.exe" "C:\nodejs\node_modules\npm\bin\npm-cli.js" "run" "unit"
npm ERR! node v6.9.5
npm ERR! npm v3.10.10
npm ERR! code ELIFECYCLE
npm ERR! [email protected] unit: karma start test/unit/karma.conf.js
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the [email protected] unit script 'karma start test/unit/karma.conf.js'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the vue-touch-keyboard package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR! karma start test/unit/karma.conf.js
npm ERR! You can get information on how to open an issue for this project with:
npm ERR! npm bugs vue-touch-keyboard
npm ERR! Or if that isn't available, you can get their info via:
npm ERR! npm owner ls vue-touch-keyboard
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR! D:\gitrepository\vue-touch-keyboard\npm-debug.log

npm ERR! Windows_NT 6.1.7601
npm ERR! argv "C:\nodejs\node.exe" "C:\nodejs\node_modules\npm\bin\npm-cli.js" "run" "test"
npm ERR! node v6.9.5
npm ERR! npm v3.10.10
npm ERR! code ELIFECYCLE
npm ERR! [email protected] test: npm run unit
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the [email protected] test script 'npm run unit'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the vue-touch-keyboard package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR! npm run unit
npm ERR! You can get information on how to open an issue for this project with:
npm ERR! npm bugs vue-touch-keyboard
npm ERR! Or if that isn't available, you can get their info via:
npm ERR! npm owner ls vue-touch-keyboard
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR! D:\gitrepository\vue-touch-keyboard\npm-debug.log

npm ERR! Windows_NT 6.1.7601
npm ERR! argv "C:\nodejs\node.exe" "C:\nodejs\node_modules\npm\bin\npm-cli.js" "run" "build"
npm ERR! node v6.9.5
npm ERR! npm v3.10.10
npm ERR! code ELIFECYCLE
npm ERR! [email protected] prebuild: npm run test
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the [email protected] prebuild script 'npm run test'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the vue-touch-keyboard package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR! npm run test
npm ERR! You can get information on how to open an issue for this project with:
npm ERR! npm bugs vue-touch-keyboard
npm ERR! Or if that isn't available, you can get their info via:
npm ERR! npm owner ls vue-touch-keyboard
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR! D:\gitrepository\vue-touch-keyboard\npm-debug.log

D:\gitrepository\vue-touch-keyboard>