Support » Installing WordPress » Botched upgrade, ‘fatal error’ message.

  • Resolved digitalculturestudies


    I upgraded from an older version of WP to the latest version, but when I try to access the /wp-admin/install.php page, I get the following error message: Fatal error: Class walker_category_checklist: Cannot inherit from undefined class walker in /homepages/44/d162186939/htdocs/dcs/wp-admin/includes/template.php on line 125

    I now cannot access my dashboard, and am not sure what to do. My site does show up, so nothing has been lost, but I am not sure what to do next. Any advice gratefully appreciated!

Viewing 6 replies - 1 through 6 (of 6 total)
  • I’d first consider deleting the WordPress files, then reupload, per Steps 7 and 8 in Upgrading_WordPress_Extended.



    I did that, although I wish I had seen those instructions first, and not the ones that came in the readme, because the instructions I followed don’t give any suggestions about backing up, etc. I deleted my files and reuploaded, and got the error message above. I did not back up, or deactivate plug ins, because those instructions were not included in the upgrade instructions, which read simply:
    Upgrading from any previous WordPress to 2.5:

    1. Delete your old WP files, saving ones you’ve modified.
    2. Upload the new files.
    3. Point your browser to /wp-admin/upgrade.php.
    4. You wanted more, perhaps? That’s it!

    So, I deleted all my WP files, uploaded the new ones, and when I pointed my browser to the URL, got the error message above.

    IS there a way to back up my site and deactivate the plugins at this point? I cannot get to my dashboard, but I can get to files on the server. And since I can’t do those two things, the link you provide says I shouldn’t do steps 7 and 8, so I am kind of stuck.

    To backup your site, you can use FTP to just download to your local machine.

    You could delete everything in the wp-contents/plugins folder–that effectively deactivates ALL plugins.



    I am not sure if you can answer this, but what should I be FTPing that will save my current entries? If I use the URL, for example, i can see every entry written in 2008, but I cannot figure out, when looking at the site architecture on my host, where, or how, those files are saved. I did use the detailed instructions for backing up my site via mySQL, but I have no way of knowing if that file is correct, or how to reinstall that once I delete all my wp files and reinstall the whole thing.

    I deleted the plugins contents, but still get the same error message.

    Your entries are backed up when you backup your database.

    Using FTP you backup the wordpress files (the programs/scripts) including your plugins and themes.

    Also make sure you clear your cache.



    Michael, I want to let you know that I am very grateful for your help! It was really kind of you to answer my questions (on a weekend!). I backed up, and reuploaded, as you suggested, and my site is back, and my WP is upgraded. Thank you, thank you!

Viewing 6 replies - 1 through 6 (of 6 total)
  • The topic ‘Botched upgrade, ‘fatal error’ message.’ is closed to new replies.