elgg multisite localhost problems

i can install elgg multisite 1.8 on localhost.

errors: otice: Undefined property: stdClass::$elggmulti_link in C:\Documents and Settings\User\Belgelerim\Downloads\xampp-win32-1.8.0-VC9\xampp\htdocs\sites\guidesites\docroot\engine\lib\multisite.php on line 295

Notice: Trying to get property of non-object in C:\Documents and Settings\User\Belgelerim\Downloads\xampp-win32-1.8.0-VC9\xampp\htdocs\sites\guidesites\docroot\engine\settings.php on line 36

Notice: Trying to get property of non-object in C:\Documents and Settings\User\Belgelerim\Downloads\xampp-win32-1.8.0-VC9\xampp\htdocs\sites\guidesites\docroot\engine\settings.php on line 37

Notice: Trying to get property of non-object in C:\Documents and Settings\User\Belgelerim\Downloads\xampp-win32-1.8.0-VC9\xampp\htdocs\sites\guidesites\docroot\engine\settings.php on line 38

Notice: Trying to get property of non-object in C:\Documents and Settings\User\Belgelerim\Downloads\xampp-win32-1.8.0-VC9\xampp\htdocs\sites\guidesites\docroot\engine\settings.php on line 39

Notice: Trying to get property of non-object in C:\Documents and Settings\User\Belgelerim\Downloads\xampp-win32-1.8.0-VC9\xampp\htdocs\sites\guidesites\docroot\engine\settings.php on line 40

Notice: Trying to get property of non-object in C:\Documents and Settings\User\Belgelerim\Downloads\xampp-win32-1.8.0-VC9\xampp\htdocs\sites\guidesites\docroot\engine\settings.php on line 41

 

Notice: Undefined index: user in C:\Documents and Settings\User\Belgelerim\Downloads\xampp-win32-1.8.0-VC9\xampp\htdocs\sites\guidesites\multi\pages\titlebar.php on line 7
 
why ?