while moving wp to root directory "An Unknown error is occured"

While moving wp from htdocs to root directory .I cant because of this message.“An Unknown error is occured”…What to do now??

htdocs already act as root directory of your site, which accessible by calling your domain name, http://mydomain.com

The actual root / is unusable for us. I think it’s system reserved.

@Joo_Nath said:
htdocs already act as root directory of your site, which accessible by calling your domain name, http://mydomain.com

The actual root / is unusable for us. I think it’s system reserved.

Yes it is. Also, there is a file called “DO NOT UPLOAD FILES HERE” which should be treated as a warning when uploading files. Htdocs is and should be treated as a the root directory. Anything else is System files and should be left alone.