I’ve just updated Cornerstone and Pro via my Wordpress dashboard, and am am now getting this error on my site www.garymerry.com
Fatal error: Can’t use method return value in write context in /var/sites/g/garymerry.com/public_html/wp-content/themes/pro/cornerstone/includes/classes/admin/class-admin.php on line 286
I can’t log in to my Wordpress now either (same error message).
Thanks for brining this to our attention. I’ve checked and can confirm it happens on PHP versions 5.4 and older when you are logged into the site. We will get an update out to resolve this.
Be advised that you’re using a PHP version that is no longer supported. You can learn more about this here: http://php.net/eol.php
We would suggest that you contact your host and ask that they get your site on a supported version of PHP. All of the hosts we recommend meet this criteria. You can learn more about them here: https://theme.co/hosting/
Thanks Alexander, I’ll get in touch with my host.
Let us know how it goes 
This was sorted with an update to PHP.
Ok great! Thanks for letting us know.
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