Hello Olgerva, need more information on this to troubleshoot.
Try using the WP Debug True and enable debugging mode or go to PHP Application settings configuration and click show error YES.
Go to wp-config and set define( 'WP_DEBUG', false ); to define( 'WP_DEBUG', true );
Also, Please share more information on what kind of server you are using, Apache, Nginx, PHP version.
I have been using AAPanel for more than 6 months now, Works flawlessly for WordPress. Would love to help you out.