Lots of errors - multisite module

I tried adding the multisite module and hereis what when I launch my site abouve my page being displayed.
Warning: main(includes/config_sites/sites_switch.php): failed to open stream: No such file or directory in /hsphere/local/home/pcccompu/pcccomputer.com/zen-cart/includes/configure.php on line 13

Warning: main(): Failed opening 'includes/config_sites/sites_switch.php' for inclusion (include_path='.:/usr/local/PEAR') in /hsphere/local/home/pcccompu/pcccomputer.com/zen-cart/includes/configure.php on line 13

Warning: main(includes/config_sites/sites_switch.php): failed to open stream: No such file or directory in /hsphere/local/home/pcccompu/pcccomputer.com/zen-cart/includes/configure.php on line 13

Warning: main(): Failed opening 'includes/config_sites/sites_switch.php' for inclusion (include_path='.:/usr/local/PEAR') in /hsphere/local/home/pcccompu/pcccomputer.com/zen-cart/includes/configure.php on line 13

Warning: session_start(): Cannot send session cookie - headers already sent by (output started at /hsphere/local/home/pcccompu/pcccomputer.com/zen-cart/includes/configure.php:13) in /hsphere/local/home/pcccompu/pcccomputer.com/zen-cart/includes/functions/sessions.php on line 108

Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /hsphere/local/home/pcccompu/pcccomputer.com/zen-cart/includes/configure.php:13) in /hsphere/local/home/pcccompu/pcccomputer.com/zen-cart/includes/functions/sessions.php on line 108

Warning: Cannot modify header information - headers already sent by (output started at /hsphere/local/home/pcccompu/pcccomputer.com/zen-cart/includes/configure.php:13) in /hsphere/local/home/pcccompu/pcccomputer.com/zen-cart/includes/init_includes/init_templates.php on line 78


If I try to launch the admin console I get this;

Warning: file(includes/spiders.txt): failed to open stream: No such file or directory in /hsphere/local/home/pcccompu/pcccomputer.com/zen-cart/admin/includes/init_includes/init_sessions.php on line 66

Warning: session_start(): Cannot send session cookie - headers already sent by (output started at /hsphere/local/home/pcccompu/pcccomputer.com/zen-cart/admin/includes/init_includes/init_sessions.php:66) in /hsphere/local/home/pcccompu/pcccomputer.com/zen-cart/admin/includes/functions/sessions.php on line 84

Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /hsphere/local/home/pcccompu/pcccomputer.com/zen-cart/admin/includes/init_includes/init_sessions.php:66) in /hsphere/local/home/pcccompu/pcccomputer.com/zen-cart/admin/includes/functions/sessions.php on line 84

Warning: Cannot modify header information - headers already sent by (output started at /hsphere/local/home/pcccompu/pcccomputer.com/zen-cart/admin/includes/init_includes/init_sessions.php:66) in /hsphere/local/home/pcccompu/pcccomputer.com/zen-cart/admin/includes/init_includes/init_templates.php on line 79

Warning: main(includes/modules/extra_definitions.php): failed to open stream: No such file or directory in /hsphere/local/home/pcccompu/pcccomputer.com/zen-cart/admin/includes/init_includes/init_templates.php on line 84

Warning: main(includes/modules/extra_definitions.php): failed to open stream: No such file or directory in /hsphere/local/home/pcccompu/pcccomputer.com/zen-cart/admin/includes/init_includes/init_templates.php on line 84

Warning: main(includes/modules/extra_definitions.php): failed to open stream: No such file or directory in /hsphere/local/home/pcccompu/pcccomputer.com/zen-cart/admin/includes/init_includes/init_templates.php on line 84

Warning: main(): Failed opening 'includes/modules/extra_definitions.php' for inclusion (include_path='.:/usr/local/PEAR') in /hsphere/local/home/pcccompu/pcccomputer.com/zen-cart/admin/includes/init_includes/init_templates.php on line 84

Warning: Cannot modify header information - headers already sent by (output started at /hsphere/local/home/pcccompu/pcccomputer.com/zen-cart/admin/includes/init_includes/init_sessions.php:66) in /hsphere/local/home/pcccompu/pcccomputer.com/zen-cart/admin/includes/functions/general.php on line 34

Dont look good to me. Help!

Well I tried again I dont have all the errors, but now I get my domain not found error when trying to open the store.