laravel No supported encrypter found. The cipher and / or key length are invalid

Question

I am building a project using Laravel. It was working fine on localhost, but when I upload it to the server (the server has comodo ssl installed), I receive the following er

Answer 1

if you are using app.php configuration file instead of reading key from .env file, then you can remove the env() function on key variable, ex:

'key' = env('someRandom36CharsString'),

to

'key' = 'someRandom36CharsString',

Answer 2

In root directory, if there is .env.example file then change it to .env and then run php artisan key:generate. This worked for me.