wp-content/plugins/better-wp-security/functions/bwps.php on line 1387

After changing the wp-content folder the plugin gives this error, and alls plugins and themes aren’t visible within the wordpress admin interface. after changing the content folder to it’s original name”wp-admin” everything works again.

this is the error:
Warning: chmod() [function.chmod]: Operation not permitted in /public_html/wp-content/plugins/better-wp-security/functions/bwps.php on line 1387