Managing Files w/ Plesk - Root

[Budget101]

I have been trying to set up a custom error 404 pg, however, when I go into the error_docs file and click on add a new file, It tells me the following:

Error: Unable to create file /error_docs/404: filemng failed: cp: cannot create regular file `/var/www/vhosts/domain.com/error_docs/404': Permission denied filemng: Error occured during /bin/cp command.

I contacted the Company hosting the server and was told that this Must be done through SSH only. How do I add a custom error404 page through SSH???

In addition, I have tried to go the easier route and add ErrorDocument 404 /404.php to my htaccess file instead & that won't work either.

It still shows an the original 404 message ...