Why doesn't browser-sync open a browser?

Question

gulp.js

When running the gulp browser-sync command, an error is thrown and the browser does not open localhost. You can open it manually, but all the same, changes will only be made when the page is refreshed. I did not find any effective advice on the Internet (badly searched ??).

var gulp          = require('gulp'),           
      browserSync = require('browser-sync');

gulp.task('browser-sync', function() {
    browserSync({
    	server: {
    		baseDir: './app'
    	},
    	notify:false  	
    });
});

Answer 1

I don’t know how this is connected, maybe someone will have an explanation, but after an hour of trying, the idea worked to start the terminal without administrator rights)

Answer 2

gulp.task('browser-sync', function() {
  browserSync.init({
    server: {
      baseDir: 'assets/app/'
    },
    notify: false
  });
});

Above indicated your task. Perhaps the problem is not in the gallop, but try adding init as I did, and it's already dancing. I forgot to mention, when creating browserSync I also have this line:
browserSync = require('browser-sync').create(),