TypeError: Object #<Gulp> has no method 'series'

[dasibre]

I get TypeError: Object #<Gulp> has no method 'series' when i trying running gulp with the example Gulpfile in the documentation.

I tracked down the error to line 56 in boilerplate-gulp-css/main.js:56:10 looked through gulp API and I couldn't find a #series method for gulp. Any help would be appreciated. //_// // Dependencies // //_// gulp.task('bpcss:build', gulp.parallel( 'bpcss:lint', gulp.series( 'bpcss:clean', 'bpcss:bundle', 'bpcss:minify' ) ));