loading ci4 app on server

provide as much info as you can ; you've not actually provided even an actual evidence of an error . Whats the url to your domain ?
what os were you developing on.

What steps did you take  to get online ? you can leave debug level 9 and leave this line in .env to help get info

Code:

CI_ENVIRONMENT = development

All sorts of issues on CI4 and other frameworks can result in files not being 644 and dirs 755 chmod permissions

did you look at logs ?

its useful to stick try catch blocks in controllers eg 

Code:

try

{
//code block 
}

catch ( \Exception  $e)
{

$data = [
'title'  => 'info',
 
  'info'=>'something went wrong with new blog' ,
  'infoException'=>'the problem is :'.$e->getMessage(),
  'date'=>$this->myDate,
];

echo view('info2', $data);
die();

}

So while in dev i have  try catch like above; when something is a miss i try to get error and for my convenience get it output nicely to a info view . yeah we want security ; but that comes after its up and working

CMS CI4 A CMS system, runs out of the box written on top of CI4

Arch Book  CodeIgniter4 on Apache(pages 92-114) 

CI4-CMS Github