firefly-iii/app/config/homestead/app.php

<?php
return [
    /*
    |--------------------------------------------------------------------------
    | Application Debug Mode
    |--------------------------------------------------------------------------
    |
    | When your application is in debug mode, detailed error messages with
    | stack traces will be shown on every error that occurs within your
    | application. If disabled, a simple generic error page is shown.
    |
    */
    'debug' => true,
    'log_level'       => 'debug',
];