@bkno I added this but it didn't fix it for me. Am I supposed to do something after adding it? Ran: composer dump autoload but that didn't make a difference.
Hi mine worked by checking the package.json of laravel https://github.com/laravel/laravel/blob/5.1/package.json mine indicated that it was downloading the "laravel-elixir": "^1.0.0" and found out that the repo was updated, and it should download the version "laravel-elixir": "^4.0.0" with "require-dir": "^0.3.2"