Support » Plugin: Yoast SEO » Fatal error … wordpress-seo/admin/ajax.php on line 59

  • When I click the rebuild XML sitemap button I get this error:

    Fatal error: Call to undefined function: memory_get_usage() in /home/tettinx/public_html/blog/wp-content/plugins/wordpress-seo/admin/ajax.php on line 59

    Anybody experienced this error?
    Not that tech savy so any suggestions / solutions are more then welcome!

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  • I suspect you are running with a very old version of PHP. memory_get_usage() is a standard function of the PHP core. It’s been around since PHP 4.3.2, which is really old — like maybe 5 or 6 years old.

    To check what you have, create a file called info.php (or whatever) and put the following in it:


    Now go to This will give you all sorts of interesting information about your server setup, including (right at the very top) what version of PHP is being used. Ideally, you want to see at least 5.2.

Viewing 1 replies (of 1 total)
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