Upgrade error on the newest X update

[wtony]

Hi,

I’m getting this error after upgrading.

[christian]

Hey @wtony,

The fatal error is undefined function wp_filter_content_tags. You might be using an old version of WordPress that does not have that function yet. Please first update WordPress to the latest version and before reporting an issue to us, please remember to always perform the basic troubleshooting steps outlined here https://theme.co/docs/common-issues as it contains the common solutions including updating everything in your site.

Also, it’s strongly recommended to test updates in a test or staging copy of your site in another server.

If updating everything in your site doesn’t help, please try reinstalling X and Cornerstone.

If it still won’t help, please give us the following info in a Secure Note

• WordPress Login URL
• Admin username and password
• FTP credentials (ask your web host if you’re not familiar with this)

You can find the Secure Note button at the bottom of your posts.

Thanks.