Upgrade to WordPress 2.6
August 11, 2008 Tech Problems Comments OffI lost several hours today upgrading from WordPress 2.5 to 2.6. I followed all of the installation instructions to the letter, but kept getting the following error message:
Warning: Cannot modify header information - headers already sent by....After installing the new files and then uploading the old wp-config.php file, I was beating my head into the wall.
Finally, after debugging through things, I found that the WP 2.5 wp-config file has an extra newline character (’\n’) at the end of the %> tag. Completely undetectable, I lost hours trying to solve the problem. It appears that 2.5 was either more forgiving or there was some extra code in 2.6 that caused a problem with the extra newline.
I’m just posting this just in case anyone else runs into trouble - check the end of the wp-config.php file for any extra newline characters.