Hi @gnumengor,
Did you install a new plugin or edit your theme’s files before the issue came up?
Try the following guidance to manually reset your plugins (the guidance assumes you can’t access the dashboard):
https://codex.ww.wp.xz.cn/FAQ_Troubleshooting#How_to_deactivate_all_plugins_when_not_able_to_access_the_administrative_menus.3F
If the above resolves the issue, reactivate each plugin individually until you find the cause.
If the above doesn’t resolve the issue, access your server via SFTP or FTP, or a file manager in your hosting account’s control panel, navigate to /wp-content/themes/ and rename the directory of your currently active theme. This will force the default theme to activate and hopefully rule-out a theme-specific issue.
Thanks!
