issue with composer when deploying using Envoyer

Hi

I'm having trouble deploying my laravel app using envoyer, the error accuer in installing composer dependencies, here it is:

Generating autoload files

Illuminate\Foundation\ComposerScripts::postInstall php artisan optimize

[RuntimeException] No supported encrypter found. The cipher and / or key length are invalid.

it's my first time and I'm having lots of errors and don't really know how to https://omegle.club fix https://omegle.ws them , I'd appreciate the help thanks