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It says unable to create directory when i try to create new directory outside htdocs folder in the root folder.
Actually you're unable to, and I don't know why you would need it, probably it's can't be allowed.
You can't create new files and directories outside the htdocs folders. You can only modify files within the folders of your websites.
@Admin but we can do that in root file that we're see after connected(with all domains folders), as I tried it works.