Your WordPress file permissions do not allow plugins to be installed.
What archives and what type of permissions needed for fix this? Regards!
Hi There,
Please take a look at this article: http://www.wpbeginner.com/beginners-guide/how-to-fix-file-and-folder-permissions-error-in-wordpress/.
Hope it helps 
Respuesta: 550 SITE CHMOD command failed.
What’s the problem? Thanks!
I try change permissions for filezilla / cpanel and nothing
I try install cornerstone by ftp , and can update the plugin but i have a problem.
Fatal error: Cannot redeclare cs_generate_data_attributes() (previously declared in /var/www/vhost/zetaunosoluciones.es/home/html/colegio/wp-content/plugins/tco-video-lock/functions/includes/cs/helpers.php:4) in /var/www/vhost/zetaunosoluciones.es/home/html/colegio/wp-content/plugins/cornerstone/includes/utility/helpers.php on line 144
Hi There,
Try deleting the Video Lock plugin folder under wp-content/plugins/tco-video-lock
Then install it again after activating Cornerstone.
Hope that helps.
And this problem?
Hi there,
It must be the FTP user access that is causing the issue.
It would be best if you contact your hosting provider as they will be able to look in to is as the file permission is part of the hosting.
Let us know how it goes.