Roundcube Folder Disappear and cannot install by custom build

Suddenly, the roundcube folder disappear, /var/www/html/roundcubemail-1.xx (xx means I don't know the exact version number)

I tried to install it again by typing
./build roundcube
in /usr/local/directadmin/custombuild/

It only shows:
mail-header-patch=yes is set in the options.conf, but is not required with this php version.
To enable the X-Mail header, set mail.add_x_header to 1 in your php.ini
Editing roundcube configuration...
Roundcube 1.3.0 has been installed successfully.

But it did not create any roundcube folder and certainly cannot access the roundcube.

DirectAdmin Forums...