Laravel 5.4 : The only supported ciphers are AES-128-CBC and AES-256-CBC with the correct key lengths

Question

It is Laravel 5.4 setup of my web app. one thing is happening repeatedly on page load. and because of that, I am not able to get data on my page.

Runtime e

Answer 1

i was getting the same error
run this command
php artisan key:generate
and then this command
php artisan config:clear