Why is an error displayed when executing several tasks in one?

Question

gulp.js

There is a task:
gulp.task('watch',['browser-sync','prefix'],function(){
gulp.watch('fashion/*.html');
});
and when you run this task, an error is displayed:

browser-sync and prefix separately run without problems.

Answer 1

You are using version 3 Gulp.
To solve your problem, you need:
If you want to take a step on the first option, you will have to enter this command into the console:
npm uninstall -g gulp && npm i -g [email protected]and your code will work.
Otherwise, leave yours Gulp 4and follow this link and read the instructions.
Here is the code for you Gulp 4:

gulp.task('watch', function(){
  browserSync.init({
      сюда конфиг вашего сервера
});
  gulp.watch("Путь к файлам Html", gulp.series('html'));  // <--- В кавычках название таска
  gulp.watch("Путь к файлам CSS", gulp.series('prefix'));
})

I will explain at the expense of paralleland series. That is, in the first case, your task-and in the thread are executed together. And in another case, the first one will be executed first task, then the second, the third and to the end.