Just updated the Cornerstone plugin and now my website shows the following error message. I can’t make any edits to the website because all pages show this error:
Parse error: syntax error, unexpected ‘[’ in /home/content/43/9506943/html/wp-content/plugins/cornerstone/includes/classes/admin/class-updates.php on line 222
I have access to FTP site and can edit those files, if needed.