cybermind

the same files are working well int the old server

yes and it has no effect

I have replaced wp-admin/ with an old backup the error message changed. Now I get :

Fatal error: Cannot redeclare wp_load_image() (previously declared in /home/radioble/public_html/wp-includes/media.php:241) in /home/radioble/public_html/wp-admin/includes/image.php on line 168

Also my FTP client can’t upload the wp-admin.css file it always fail.

I don’t think that the problem is due to theme or plugins. I have 2 wordpress sites with different themes and plugins but I have the same problem with bith.

https://radiodubled.com/wp-admin/
https://rap-tunisien.net/wp-admin/

The Error 500 occurs only when I login to wp-admin/ with admin account.
But it works normal when I login with a registred user, author …

I get trouble shooting only when I try to login wp-admin with admin account.

https://radiodubled.com

moved website to a new web server

I have not changed any thing. I have moved server too many times but this is the first time that I get this problem.