Error - "Task function must be specified"

I’ve updated my GULP to v4 and i’m getting this error. Here’s the log:

C:\xampp\htdocs\project>gulp

assert.js:89
  throw new assert.AssertionError({
  ^
 AssertionError: Task function must be specified
    at Gulp.set [as _setTask] (C:\xampp\htdocs\project\node_modules\gulp\node_modules\undertaker\lib\set-task.js:12:3)
    at Gulp.task (C:\xampp\htdocs\project\node_modules\gulp\node_modules\undertaker\lib\task.js:13:8)
    at Object.<anonymous> (C:\xampp\htdocs\project\gulpfile.js:47:6)
    at Module._compile (module.js:425:26)
    at Object.Module._extensions..js (module.js:432:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:311:12)
    at Module.require (module.js:366:17)
    at require (module.js:385:17)
    at Liftoff.handleArguments (C:\Users\vsync\AppData\Roaming\npm\node_modules\gulp\bin\gulp.js:116:3)

[yairEO]

@bradodarb - The fix was to go back to v3 😃

[ku3mich]

https://fettblog.eu/gulp-4-parallel-and-series/ because gulp.task(name, deps, func) was replaced by gulp.task(name, gulp.{series|parallel}(deps, func))