tashreef wrote:
Yes, there is /SRV directory, but when I open it, it shows empty.
I used access it earlier without any problem. Now don't know what causing this.
Could this be a permission issue?
Depending what user you're trying to access it as, potentially. Though root or the www-data user (usually named by default) should be able to see into it fine, are you using either one of those to attempt to access the folder? (Though using root to edit/modify web files would be a bad idea, but to simply 'check' if things exist you can't get more permission than root for the most part.)
You may also want to try for the hell of it,
https://wordpress.org/plugins/wordpress-php-info/Use that plugin temporarily to see phpinfo(), which will tell you what your document path is, specifically you'll want to look towards the bottom for a
_SERVER["DOCUMENT_ROOT"] value, that will show you the general path where your wordpress is installed.
Just disable/remove that plugin after using it (no point in keeping plugins only needed once installed forever).