Error 'Task gulp.spritesmith is not in your gulpfile'?

Question

gulp.js

Hello. There was such an error when trying to run
spritesmith in gulp
there is spritesmith in gulpfile, it is also in package.json after installation.

var gulp = require('gulp'),
    sass = require('gulp-ruby-sass'),
    autoprefixer = require('gulp-autoprefixer'),
    browserSync = require('browser-sync').create(),
    pug = require('gulp-pug'),
  spritesmith = require('gulp.spritesmith'),
    prettify = require('gulp-prettify'),
    uncss = require('gulp-uncss');

gulp.task('sprite', function () {
  var spriteData = gulp.src('img/icons/*.png').pipe(spritesmith({
    imgName: 'sprite.png',
    cssName: 'sprite.sass',
    imgPath: '/img/sprite.png' 
  }));
  spriteData.css.pipe(gulp.dest('./sass/'));
  spriteData.img.pipe(gulp.dest('./img/'));  
});

Answer 1

gulp sprite
You need to run by the name of the task, not the module.