Copy ".env.example" to ".env" then run this command: "php artisan key:generate" to generate new APP_KEY
When you specify
'cipher' => 'AES-128-CBC',
in your app.php, you just need a 128 bit key as value for APP_KEY.
Otherwise you can set like this to use a 256 bit key.
'cipher' => 'AES-256-CBC',
In both case you can solve the problem running the command: php artisan key:generate
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