throw er; // Unhandled 'error' event less/parser.js:333:27

events.js:85
      throw er; // Unhandled 'error' event
            ^
Error
    at new Parser (C:\dev\cw2\node_modules\gulp-less\node_modules\less\lib\less\parser.js:333:27)
    at Object.less.render (C:\dev\cw2\node_modules\gulp-less\node_modules\less\lib\less\index.js:18:22)
    at Transform._transform (C:\dev\cw2\node_modules\gulp-less\index.js:38:10)
    at Transform._read (C:\dev\cw2\node_modules\gulp-less\node_modules\through2\node_modules\readable-stream\lib\_stream_transform.js:184:10)
    at Transform._write (C:\dev\cw2\node_modules\gulp-less\node_modules\through2\node_modules\readable-stream\lib\_stream_transform.js:172:12)
    at doWrite (C:\dev\cw2\node_modules\gulp-less\node_modules\through2\node_modules\readable-stream\lib\_stream_writable.js:237:10)
    at writeOrBuffer (C:\dev\cw2\node_modules\gulp-less\node_modules\through2\node_modules\readable-stream\lib\_stream_writable.js:227:5)
    at Transform.Writable.write (C:\dev\cw2\node_modules\gulp-less\node_modules\through2\node_modules\readable-stream\lib\_stream_writable.js:194:11)
    at write (C:\dev\cw2\node_modules\gulp\node_modules\vinyl-fs\node_modules\through2\node_modules\readable-stream\lib\_stream_readable.js:623:24)
    at flow (C:\dev\cw2\node_modules\gulp\node_modules\vinyl-fs\node_modules\through2\node_modules\readable-stream\lib\_stream_readable.js:632:7)

Solution:

$> npm uninstall gulp-less
and then :
$> npm install gulp-less


Additional links for related error : https://github.com/mcasimir/generator-mobileangularui/issues/14