Support » Installing WordPress » Fatal error: Call to undefined function update_core() when auto upgrading

  • Resolved jwurster

    (@jwurster)


    When I click on the auto upgrade button, I get this error:

    Fatal error: Call to undefined function update_core() in /home/xxxxx/public_html/lemon/wordpress/wp-admin/includes/class-wp-upgrader.php on line 895

    I haven’t had any trouble auto upgrading plugins as recently as today. Any help would be appreciated.

    One added piece of info is that I get the following error when auto upgrading:

    Unpacking the update…

    Incompatible Archive.: PCLZIP_ERR_BAD_FORMAT (-10) : Unable to find End of Central Dir Record signature

    Installation Failed

    It seems I get one error or the other.

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