Argument 1 passed to CodeIgniter must be an instance of Config\App, null given

would be nice to see your virtual code, but did you chmod 777 -R writable

check inside for permissions inside writable since structure is:

Code:

directories, 689 files
[andrew@darkstar:http/andrinaPerfectBeauty.com]$ tree -L 1  writable                                                                                          (11-26 19:09)
writable
├── Art
├── Art2
├── cache
├── debugbar
├── logs
├── session
└── uploads

//forget Art Art2 thats my SQlite in my case

CMS CI4     I use Arch Linux by the way