Почему cannot get происходит GULP?

Question

[rostyslavvvv]

Раньше работало, а сейчас перестало.. уже все нервы съело..

let gulp = require('gulp');
const sass = require('gulp-sass')(require('node-sass'));
const autoprefixer = require('gulp-autoprefixer');
let browserSync = require('browser-sync')
let useref = require('gulp-useref');
let uglify = require('gulp-uglify-es').default;
let gulpIf = require('gulp-if');
let cssnano = require('gulp-cssnano');
let imagemin = require('gulp-imagemin');
let cache = require('gulp-cache');
let del = require('del');
let version = require('gulp-version-number');

// Development Tasks
// -----------------

// Start browserSync server
gulp.task('browserSync', function() {
  browserSync({
    server: {
      baseDir: './app'
    }
  })
});

gulp.task('sass', function() {
  return gulp.src('app/scss/**/*.scss') // Gets all files ending with .scss in app/scss and children dirs
    .pipe(sass().on('error', sass.logError)) // Passes it through a gulp-sass, log errors to console
    .pipe(autoprefixer())
    .pipe(gulp.dest('app/css')) // Outputs it in the css folder
    .pipe(browserSync.reload({ // Reloading with Browser Sync
      stream: true
    }));
});

// Watchers
gulp.task('watch', function() {
  gulp.watch('app/scss/**/*.scss', gulp.series('sass'));
  gulp.watch('app/*.html', browserSync.reload);
  gulp.watch('app/js/**/*.js', browserSync.reload);
});

// Optimization Tasks 
// ------------------

// Optimizing CSS and JavaScript 
gulp.task('useref', function() {

  return gulp.src('app/*.html')
    .pipe(useref())
    .pipe(gulpIf('*.js', uglify()))
    .pipe(gulpIf('*.css', cssnano()))
    .pipe(version({
      'value': '%MDS%',
      'append': {
        'key': 'v',
        'to': ['css', 'js'],
      },
    }))
    .pipe(gulp.dest('dist'));
});

// Optimizing Images 
gulp.task('images', function() {
  return gulp.src('app/images/**/*.+(png|jpg|jpeg|gif|svg)')
    // Caching images that ran through imagemin
    .pipe(cache(imagemin({
      interlaced: true,
    })))
    .pipe(gulp.dest('dist/images'))
});

// Copying fonts 
gulp.task('fonts', function() {
  return gulp.src('app/fonts/**/*')
    .pipe(gulp.dest('dist/fonts'))
});

// Copying .htaccess
gulp.task('hta', function() {
  return gulp.src('app/.htaccess')
      .pipe(gulp.dest('dist/'))
});

// Cleaning 
gulp.task('clean', function() {
  return del.sync('dist').then(function(cb) {
    return cache.clearAll(cb);
  });
});

gulp.task('clean:dist', function() {
  return del(['dist']);
});

// Build Sequences
// ---------------

// define complex tasks
const watch = gulp.parallel('sass', 'browserSync', gulp.series('watch'));
const build = gulp.series('clean:dist', 'sass', gulp.parallel('useref', 'images', 'fonts', 'hta'));

exports.watch = watch;
exports.build = build;