WordPress 2.9 upgrade error message; “class-json.php on line 238”

  • Resolved pivic

    (@pivic)


    16 years, 6 months ago

    Hey there!

    I recently upgraded my WordPress installation from the-one-before-2.9 and I’m getting this error message to and fro:

    Warning: Cannot modify header information - headers already sent in /wp-includes/class-json.php on line 238

    By checking my blog, niklasblog.com, you’ll see the error-message in the sidebar on the right-hand side, just above “Meta”.

    I’ve tried to deactivate every plug-in one by one, but the error message is still there, in-between every deactivation.

    Can anybody help me remove said error message? I’d be very grateful for any help regarding this. I cannot code.

    While deactivating one of my plug-ins, the error message was extended as follows:

    Warning: Cannot modify header information - headers already sent by (output started at /home1/niklasbl/public_html/wp-admin/admin-header.php:18) in /home1/niklasbl/public_html/wp-includes/class-json.php on line 238

    This made me look at line 18 in admin-header.php, which looks as follows:

    <html xmlns="http://www.w3.org/1999/xhtml" <?php do_action('admin_xml_ns'); ?> <?php language_attributes(); ?>>

    As previously written, any help would be much appreciated!

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