Cornerstone disappeared on PRO

I had cornerstone and then realized today that it has disappeared. This is the error I get when I try to reinstall.
Fatal error: Cannot redeclare class Cornerstone_Plugin_Base in /var/www/vhosts//httpdocs/cms/wp-content/plugins/cornerstone/includes/utility/plugin-base.php on line 6

Hi there,

This error would occur if you try to install Cornerstone separately on Pro.

Please note that if you are using Pro, Cornerstone is already native to it so it does not need to be installed as another plugin as that would trigger the error.

When you edit a page on Pro, instead of seeing Text/HTML/Cornerstone, you will see Text/HTML/Pro.

So kindly login through FTP then go to wp-content/plugins then delete the current cornerstone directory that is in there.

Hope this helps.

Ok, Thanks,

I failed to mention that I am unable to edit Posts with Cornerstone which I believe I have done in the past. I am seeing Text/HTML/Pro for Page but not Post.

Hi again,

To enable Pro content builder for posts, please navigate to Pro > Settings > General and click on Posts to enable the builder on posts.

To learn more about permissions please see


Thank you very much. Working 100% now.

Glad to hear it’s sorted. :slight_smile:

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