Uncaught Error: Call to undefined function wp_is_block_theme()

  • Hi, after updating to the latest WP 5.9, i facing this issue when i try to access wp-admin page. What should i do ?

    Fatal error: Uncaught Error: Call to undefined function wp_is_block_theme() in /home/jicsg/public_html/jumeirah2/wp-admin/menu.php:205 Stack trace: #0 /home/jicsg/public_html/jumeirah2/wp-admin/admin.php(158): require() #1 /home/jicsg/public_html/jumeirah2/wp-admin/index.php(10): require_once('/home/jicsg/pub...') #2 {main} thrown in /home/jicsg/public_html/jumeirah2/wp-admin/menu.php on line 205
There has been a critical error on this website. Please check your site admin email inbox for instructions.
Viewing 4 replies - 1 through 4 (of 4 total)
  • Moderator Steven Stern (sterndata)

    (@sterndata)

    Volunteer Forum Moderator

    Everyone on this topic:

    This may be a plugin or theme conflict. Please attempt to disable all plugins, and use one of the default (Twenty*) themes. If the problem goes away, enable them one by one to identify the source of your troubles.

    If that makes a difference or you identify a plugin or theme, please let us know.

    Other folks: Please do not add a “I have the same problem” reply as that just makes the topic much harder to manage. If you want to follow the topic, click the subscribe button in the sidebar.

    It’s possible that your site had an incomplete update. Please try doing a manual update and seeing if that fixes the issue.

    If that doesn’t fix it, some more info to be able to help narrow this down would be to understand if this is this on all wp-admin pages or only a subset of pages? For example, can you access yourdomain.com/wp-admin/edit.php or yourdomain.com/wp-admin/index.php or is this only on specific pages? Is your site a single install or a part of a multisite install? Is this for all user roles or only some roles?

    Moderator Steven Stern (sterndata)

    (@sterndata)

    Volunteer Forum Moderator

    Please go to TOOLS->SITE HEALTH. Click on the INFO tab. Click the “COPY” button to copy the report to the clipboard, then paste in a reply here.

    Items of interest include what version of PHP you’re using.

    Karan

    (@karanrocks)

    Hey, I had the same problem (no access to WordPress Dashboard) after WordPress 5.9 update. I have fixed it by doing a manual update. WP was not updated successfully (Some files were missing in the wp-admin directory). Please try to upload/replace latest WP core files via cPanel or FTP And can check If you problem solved.

Viewing 4 replies - 1 through 4 (of 4 total)
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