why when you install 2.3 all the time it comes out?

[Oleg06]

why when you install 2.3 all the time it comes out?

Code:

Notice: Undefined variable: SITEURL in /home/cp068800/public_html/neowebtime.ru/0/admin/inc/common.php on line 94

Warning: Cannot modify header information - headers already sent by (output started at /home/cp068800/public_html/neowebtime.ru/0/admin/inc/common.php:94) in /home/cp068800/public_html/neowebtime.ru/0/admin/inc/common.php on line 136

constantly having to write http://exemple.ru/0/admin/install.php?
after which it appears here

Code:

Notice: Undefined variable: SITEURL in /home/cp068800/public_html/neowebtime.ru/0/admin/inc/common.php on line 94

after installation appears here is

Code:

Warning: unlink(../temp.gsconfig.php) [function.unlink]: ��� ������ ����� ��� �������� in /home/cp068800/public_html/neowebtime.ru/0/admin/setup.php on line 180

Warning: Cannot modify header information - headers already sent by (output started at /home/cp068800/public_html/neowebtime.ru/0/admin/setup.php:180) in /home/cp068800/public_html/neowebtime.ru/0/admin/inc/cookie_functions.php on line 26

Warning: Cannot modify header information - headers already sent by (output started at /home/cp068800/public_html/neowebtime.ru/0/admin/setup.php:180) in /home/cp068800/public_html/neowebtime.ru/0/admin/setup.php on line 196

and only after authorization everything disappears

[yojoe]

Maybe another mod_rewrite rules in www root directory overwrite nested ones ?
Especially RewriteBase /