Laravel framework operation error: no application encryption key has been specified

One 、 A scenario

start-up Laravel Frame item error ：Whoops, looks like something went wrong,
modify config/app.php, Show BUG details ： hold 'debug' => env('APP_DEBUG', false), Change it to 'debug' => env('APP_DEBUG', true),, Report errors ：No application encryption key has been specified

Two 、 Reasons for appearance

• The reason for this problem is ： Not in the .env Set the application in the file Encryption key

3、 ... and 、 terms of settlement

• Linux in , Execute the command in the root of the project ：php artisan key:generate, as follows
  

• After setting successfully APP_KEY It will be in the root directory .env It shows , as follows
  

Four 、 other

• Linux Give orders ：ls -a View all files in the folder （ Including hidden files ）
• Accompanying, Laravel Report errors ：Whoops, looks like something went wrong.