I tried to update WP 3.9 but below error appear and it wont update? Warning: copy(/homepages/17/d333482360/htdocs/wp-site/wp-admin/includes/update-core.php) [function.copy]: failed to open stream: Permission denied in/homepages/17/d333482360/htdocs/wp-site/wp-admin/includes/class-wp-filesystem-direct.php on line 217 The update cannot be installed because we will be unable to copy some files. This is usually due to inconsistent file permissions.: wp-admin/includes/update-core.php Installation Failed Please help me out what to do
did you check the Folder Permission if it's set to 755 !? Did you try to Over-write the Wordpress files with the new Distribution !?
I saw a similar problem. It related to a plugin that was installed at the same time. the problem turned out to be the PHP-version. I changed it from 5.2 to 5.5 at my webhotel and that solved the problem.
if auto update not work you can update manually by downloading wordpress from wordpress.org and then replace only wp-includes and wp-admin folder on your server via ftp or control panel file manager. Now refresh your website admin panel it will update. It worked for me in those case. Before these please take backup of files and database. Thanks