node.js - gulp Task is not in your gulpfile -


new node.js, trying use gulp. got error: 

task 'styles' not in gulpfile

i see common error, can cause it? code.

both auto-prefixer , gulp in package.json file

the file name autoprefixer.js

var gulp = require('gulp'); var autoprefixer = require('gulp-autoprefixer');   gulp.task('styles',function(){     return gulp.src('css/style.css')     .pipe(autoprefixer())     .pipe(gulp.dest('build')) });

what can problem?

i found out problem... file name autoprefixer.js , not gulpfile.js should be. once changed file name worked great.


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