'unitTest' terminates with error 'Cannot start PhantomJS'

[surajplobal]

I'm using node v6.11.4 , npm 3.10.10 ,
gulp -v
[11:32:29] CLI version 3.9.1
[11:32:29] Local version 3.9.1

Please find the below logs for details

plobaltech$ sudo gulp unitTest
Password:
[11:29:15] Using gulpfile /Applications/XAMPP/xamppfiles/htdocs/plobalapps-server/diy-frontend/gulpfile.js
[11:29:15] Starting 'clean'...
[11:29:15] Starting 'analyze'...
[11:29:15] Finished 'analyze' after 145 μs
[11:29:15] Starting 'clean:test'...
[11:29:15] Finished 'clean' after 198 ms
[11:29:15] Starting 'markup'...
[11:29:15] Starting 'styles'...
[11:29:15] Starting 'bowerAssets'...
[11:29:15] Starting 'images'...
[11:29:16] Starting 'favicon'...
[11:29:16] Starting 'fonts'...
[11:29:16] Finished 'clean:test' after 959 ms
[11:29:16] Starting 'buildTests'...
[11:29:16] Finished 'favicon' after 63 ms
[11:29:16] Finished 'fonts' after 670 ms
[11:29:16] Finished 'bowerAssets' after 1.13 s
[11:29:17] Finished 'styles' after 1.67 s
[11:29:17] Finished 'buildTests' after 925 ms
[11:29:17] Finished 'images' after 1.15 s
[11:29:17] Finished 'markup' after 1.74 s
[11:29:17] Starting 'scripts'...
[11:29:17] Finished 'scripts' after 633 ms
[11:29:17] Starting 'inject'...
[11:29:18] gulp-inject 224 files into index.html.
[11:29:18] gulp-inject Nothing to inject into index.html.
[11:29:18] Finished 'inject' after 385 ms
[11:29:18] Starting 'bowerCopy'...
[11:29:18] Finished 'bowerCopy' after 91 ms
[11:29:18] Starting 'bowerInject'...
[11:29:18] Finished 'bowerInject' after 166 ms
[11:29:18] Starting 'components'...
[11:29:18] Finished 'components' after 21 ms
[11:29:18] Starting 'componentsInject'...
[11:29:18] gulp-inject 1 files into index.html.
[11:29:18] Finished 'componentsInject' after 8.06 ms
[11:29:18] Starting 'copyTemplates'...
[11:29:18] Finished 'copyTemplates' after 80 ms
[11:29:18] Starting 'deleteTemplates'...
[11:29:18] Finished 'deleteTemplates' after 42 μs
[11:29:18] Starting 'build'...
[11:29:18] Finished 'build' after 14 μs
[11:29:18] Starting 'karmaFiles'...
[11:29:18] Finished 'karmaFiles' after 219 ms
[11:29:18] Starting 'unitTest'...
09 04 2018 11:29:20.130:WARN [watcher]: Pattern "/Applications/XAMPP/xamppfiles/htdocs/plobalapps-server/diy-frontend/node_modules/karma-babel-preprocessor/node_modules/babel-core/browser-polyfill.js" does not match any file.
09 04 2018 11:29:20.875:INFO [karma]: Karma v0.13.22 server started at http://localhost:9876/
09 04 2018 11:29:20.881:INFO [launcher]: Starting browser PhantomJS
09 04 2018 11:29:21.027:ERROR [launcher]: Cannot start PhantomJS

09 04 2018 11:29:21.034:INFO [launcher]: Trying to start PhantomJS again (1/2).
09 04 2018 11:29:21.197:ERROR [launcher]: Cannot start PhantomJS

09 04 2018 11:29:21.204:INFO [launcher]: Trying to start PhantomJS again (2/2).
09 04 2018 11:29:21.352:ERROR [launcher]: Cannot start PhantomJS

09 04 2018 11:29:21.354:ERROR [launcher]: PhantomJS failed 2 times (cannot start). Giving up.

[11:29:21] 'unitTest' errored after 2.69 s
[11:29:21] Error: 1
at formatError (/Users/plobaltech/.nvm/versions/node/v6.11.4/lib/node_modules/gulp/bin/gulp.js:169:10)
at Gulp. (/Users/plobaltech/.nvm/versions/node/v6.11.4/lib/node_modules/gulp/bin/gulp.js:195:15)
at emitOne (events.js:96:13)
at Gulp.emit (events.js:188:7)
at Gulp.Orchestrator._emitTaskDone (/Applications/XAMPP/xamppfiles/htdocs/plobalapps-server/diy-frontend/node_modules/orchestrator/index.js:264:8)
at /Applications/XAMPP/xamppfiles/htdocs/plobalapps-server/diy-frontend/node_modules/orchestrator/index.js:275:23
at finish (/Applications/XAMPP/xamppfiles/htdocs/plobalapps-server/diy-frontend/node_modules/orchestrator/lib/runTask.js:21:8)
at cb (/Applications/XAMPP/xamppfiles/htdocs/plobalapps-server/diy-frontend/node_modules/orchestrator/lib/runTask.js:29:3)
at removeAllListeners (/Applications/XAMPP/xamppfiles/htdocs/plobalapps-server/diy-frontend/node_modules/karma/lib/server.js:336:7)
at Server. (/Applications/XAMPP/xamppfiles/htdocs/plobalapps-server/diy-frontend/node_modules/karma/lib/server.js:347:9)
at Server.g (events.js:292:16)
at emitNone (events.js:91:20)
at Server.emit (events.js:185:7)
at emitCloseNT (net.js:1556:8)
at _combinedTickCallback (internal/process/next_tick.js:77:11)
at process._tickCallback (internal/process/next_tick.js:104:9)