I have exactly the same problem. Very frustrating and I cant find a solution anywhere. I Thing the problem is in the vagrant box. Can we downgrade?
Laravel app throwing Exception after running vagrant reload
So I decided to do upgrades on my framework and the working environment. I upgraded my laravel version from 5.7 to 5.8. Upgraded my vagrant, virtual box and homestead to the latest versions. Since this update, i've been getting this error: 
Now whenever I destroy the vagrant box and create another one, everything works fine. But the minute I do a vagrant reload again, this exception is thrown. I've searched through google and StackOverflow for days now but I don't get anything relating to what's causing my error. Any help will be truly appreciated.
Also anytime I try to run the php:artisan command, i'm getting the following error:
In LoadConfiguration.php line 68:
Unable to load the "app" configuration file.
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