Developer to solve Laravel issue

We have an issue this Laravel,
Task is easy, just need developer know to run commands right and finish setup process.
http://zino-game.com/

production.ERROR: No application encryption key has been specified. {“exception”:”[object] (Illuminate\Encryption\MissingAppKeyException(code: 0):

https://stackoverflow.com/questions/44839648/no-application-encryption-key-has-been-specified