No Application Encryption Key Has Been Specified

I’m new to Laravel and I’m trying to use the Artisan command…

php artisan serve

It displays…

Laravel development server started: http://127.0.0.1:8000

However, it won’t automatically launch and when I manually enter http://127.0.0.1:8000 it shows this error:

RuntimeException No application encryption key has been specified.

Any ideas? I’m using Laravel framework 5.5-dev.

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