Updated to version 4.8.3.

Try downloading WordPress again, access your server via SFTP or FTP, or a file manager in your hosting account’s control panel (consult your hosting provider’s documentation for specifics on these), and delete then replace your copies of everything on the server except the wp-config.php file and the /wp-content/ directory with fresh copies from the download. This will effectively replace all of your core files without damaging your content and settings.

Some uploaders tend to be unreliable when overwriting files, so don’t forget to delete the original files before replacing them.

If that made no difference, try manually resetting your plugins (no Dashboard access required). If that resolves the issue, reactivate each one individually until you find the cause.

If that does not resolve the issue, access your server via SFTP or FTP, or a file manager in your hosting account’s control panel (consult your hosting provider’s documentation for specifics on these), 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 (theme functions can interfere like plugins).

I also face same issue

( ! ) Notice: wpdb::prepare was called incorrectly. The query does not contain the correct number of placeholders (1) for the number of arguments passed (2). Please see Debugging in WordPress for more information. (This message was added in version 4.8.3.) in /opt/lampp/htdocs/swedenresidence/wp-includes/functions.php on line 4139

If the steps posted above didn’t work for you, please open your own topic: https://www.ads-software.com/support/forum/how-to-and-troubleshooting/#new-post

Seems like my error was cause by WPML version 3.7.1…

Since that is a commercial plugin, we ask that you please go to their official support channel, so you can get support from the people who know it best: https://wpml.org/forums/forum/english-support/

Forum volunteers are not given access to commercial products, so they would not know why it is not working properly. Other community members who may have faced your issue might be able to help you but your best bet is your product’s developer. Keep in mind we encourage you to use the official support venues, as it allows the developers to be aware of issues with their code and gives back to the community in a more robust way.

had the same issue… after wpml update from 3.8.2 to 3.8.4 no more errors

??