i have this problem after i setuped my website .... how can i solve it ? here's the link http://www.ersps.org/website
the cause of this is that session.php file contains characters (usually a space or an empty line) outside of the <?php and ?> tags. To fix the problem you remove any blank characters at the beginning and end of the file. Some text editors are prone to automatically adding extra line-ending characters at the ends of files.
You're wrong Klevraco, the file which contains blank characters is configuration.php. Try to save the file in different editor. It should works.
What you could do as an alternative is get your hosting company to disable showing errors by modifying apache. Thus, the errors would disappear regardless of the coding issues.
I agree, but it looks like this guy has no idea where his code editor is to repair the lines needing to be corrected so my solution could come in handy for them.