WordPress Admin Panel Error

Try re-uploading fresh WordPress files.

then it will lost Database;

tell me which files I should upload

Try:
– switching to the default theme by renaming your current theme’s folder inside wp-content/themes and adding “-old” to the end of the folder name using FTP or whatever file management application your host provides.

– resetting the plugins folder by FTP or phpMyAdmin.

– re-uploading all files & folders – except the wp-content folder – from a fresh download of WordPress. Make sure that you delete the old copies of files & folder before uploading the new ones.

– running the upgrade manually via wp-admin/upgrade.php

Let’s see this works or not,
I had this problem many times.
if it works than Im your follower ??

Yahoooo Now it is working. thanks for helping me to improve my https://sillyjokes.mobi Site.