Laravel: Too few arguments to function Illuminate\Support\Manager::createDriver()

Question

I try to test emails with mailtrap and Laravel 5.4. I get this error:

Type error: Too few arguments to function Illuminate\\Support\\Manager::create

Answer 1

Here is possible solution

Make sure followings are not empty

BROADCAST_DRIVER=log
CACHE_DRIVER=file
SESSION_DRIVER=file
SESSION_LIFETIME=120
QUEUE_DRIVER=sync

Answer 2

I believe this happens if you do not have the APP_KEY set in a .env file, so run php artisan key:generate if you do not have one.