Instalation problem

After instalation this message of erro show in the front page


"Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /home/esportesdeaaz/www/pastateste/configuration.php:1) in /home/esportesdeaaz/www/pastateste/libraries/joomla/session/session.php on line 423

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/esportesdeaaz/www/pastateste/configuration.php:1) in /home/esportesdeaaz/www/pastateste/libraries/joomla/session/session.php on line 423

Warning: Cannot modify header information - headers already sent by (output started at /home/esportesdeaaz/www/pastateste/configuration.php:1) in /home/esportesdeaaz/www/pastateste/libraries/joomla/session/session.php on line 426
"

And the login is not possible admin and demo is not valid

This doesn't come from our side.
Please check this threat on official joomla forum.

Maybe you can find your solution there.

I saved php file (edited with notepad) in ANSI format, not UTF-8 which was default.
SO if you dont have an extra blank line, you should try this one.

Thanks for attention