Yes it would not work.
As I said before edit your forum/includes/config.inc.php file,
Change the top few lines to what it is now or what you change them to be.
Do not delete the quote surrounding the fields:
'DATABASE_SERVER' => 'USUALLY IS localhost',
'DATABASE_USER' => 'change to database user name',
'DATABASE_PASSWORD' => 'change to database user password',
'DATABASE_NAME' => 'change to database name',
This section tells the forum software how to login to the database.
If it is incorrect now then the forum can't login to the database and shows an error.
Because it can't find the posts and replies nor can it save new posts.
Hopefully everything else in the file is intact and correct.
But you should review it anyway while you are there.
When done make sure to save to the server in the includes folder.
Last edited by Ruben; 02/07/2021 3:07 PM. Reason: Added Comment