Fatal error: Call to undefined function wp_removable_query_args()

James recommended in a similar thread:

If that does not resolve the issue, access your server via FTP or SFTP, 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).

Hi, MSingAste
Try re-installing WordPress again.

Note: remember to backup your data.

Try re-installing WordPress again

Thanks, Ncej, but is there another way to reinstall WorsPress when you can’t access the Dashboard other than what I already tried, replaced all but wp-content and wp-config.php from download of WordPress?

Thanks, James. Tried renaming my theme. Same error from wp-admin (and when attempting to view my blog itself the page is blank).

Try uploading just the /wp-includes/functions.php file again (that’s the file where wp_removable_query_args() is defined).

(Also, keep in mind that you could still see the same message due to caching, so if it doesn’t go away after that file is uploaded, be sure to try logging in with a different browser, too.)

If you have access to the ftp, you can re-install wordpress.

If the problem persist after the re-installation, i will advise you to downgrade your wordpress software for the meantime until we fix this issue.

Thanks.

If you have access to the ftp, you can re-install wordpress.

If the problem persist after the re-installation, i will advise you to downgrade your wordpress software for the meantime until we fix this issue.

Thanks, Ncej, but already re-installed, remember? How do I downgrade? Where are previous versions stored?

Thank you, Girlieworks. After replacing just function.php the error changed to the following:

Fatal error: Call to undefined function wp_installing() in /homepages/25/d161191648/htdocs/wsb4027312702/blog/wp-includes/functions.php on line 1354

Tried in two different browsers.

Oh, and after replacing that function.php file my blog is no longer viewable at all! Not just the dashboard that’s broken!

Tried downgrading to the previous version. Now get:

Warning: require(/homepages/25/d161191648/htdocs/wsb4027312702/blog/wp-includes/load.php): failed to open stream: No such file or directory in /homepages/25/d161191648/htdocs/wsb4027312702/blog/wp-settings.php on line 21

Fatal error: require(): Failed opening required ‘/homepages/25/d161191648/htdocs/wsb4027312702/blog/wp-includes/load.php’ (include_path=’.:/usr/lib/php5.5′) in /homepages/25/d161191648/htdocs/wsb4027312702/blog/wp-settings.php on line 21

There definitely is an includes/load.php….

I had copied the 4.3.1 files to the wrong level. Oops! Now successfully downgraded with access to blog and dashboard. I’ll count my blessings and stay here for awhile. Thank you.

Glad it works MsingAste.

I’m glad to hear your site is working again. I know upgrading is the last thing you want to think about after having an issue like that, but it’s always best practice to keep up with the latest versions. I would recommend backing up your database and files, reviewing the procedures for updating WordPress, and trying again. Feel free to ask any questions you may have on the procedure. Good luck!