trying to run sudo apache2ctl restart installing koha

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http://askubuntu.com – I am new in ubuntu, I am trying to install koha, so I tried to restart apache2 with ... sudo apache2ctl restart but I get the following error ... Warning: DocumentRoot [/etc/apache2/OPAC_WWW_DIR] does not exist [Tue Jul 09 11:14:58] [error] (EAI 5)No address associated with hostname:could not resolve host name WEBSERVER_HOST__IP:WEBSERVER_PORT_LIBRARIAN__--ignoring Warning: DocumentRoot [/etc/apache2/INTRANET_WWW_DIR] does not exist syntax error on line 108 of /etc/apache2/sitse-enabled/koha: The port number "WEBSERVER_HOST:__WEBSERVER_PORT_LIBRARIAN__" is outside the appropriate rang (HowTos)