TypeError: Cannot read property 'slice' of undefined

[paulchill]

Hi Guys,

Getting this error when i run pureifycss for gulp
[15:18:33] 'css' errored after 32 s
[15:18:33] TypeError: Cannot read property 'slice' of undefined

Here is my gulp file:
gulp.task('css', function() {
gulp.src(config.app.css.src)
.pipe(purify(['/*.js', '/*.html']))
.pipe(minifyCss())
.pipe(concat('bundle.css'))
.pipe(gulp.dest(config.app.css.dist))
});

Any ideas?

[muslim-niche]

[12:04:55] Using gulpfile ~/gulpfile.js
[12:04:55] Starting 'purifyCSS'...
bravo
[12:04:55] 'purifyCSS' errored after 509 ms
[12:04:55] TypeError in plugin 'gulp-purifycss'
Message:
Cannot read property 'push' of undefined
Details:
domainEmitter: [object Object]
domain: [object Object]
domainThrown: false