The task does not finish the job. gulp?

Question

gulp.js

Actually there is a task to compile from SCSS to CSS along the way using autoprefixer

gulp.task('scss', function(){
  return gulp.src('app/scss/main.scss')
    .pipe(scss())
    .pipe(autoprefixer())
    .pipe(gulp.dest('app/css'))
    .pipe(browserSync.reload({stream: true}))
});

Let me explain my situation: Windows crashed, reinstalled, installed everything that was before. The code was the same, the plugins were the same. But then it worked, but now it doesn't.
This is literally what happens