Warning: Cannot modify header information – /wp-includes/pluggable.php on line 3

no help ???

The problem is in one of your config files (wp-config.php or config.php in the bbpress dir)
Make sure you have no blank lines left at the end of each file.
Greets

actually, thats NOT the problem.

Perfect this was my issue too and removing the white space fixed it

I was having the same problem as above and clearing the lines at the end of the config file fixed it. Thanks mvandenberghe

For the OP I’d try uploading wp-settings.php again.

I have had this issue before, too(or at least a very similar issue) and the problem was that there was a blank space in the config file. It can happen either before or after the opening and closing php tags.

actually, thats NOT the problem.

Out of curiosity, what else might be the problem if it isn’t the blank space?

[Edit] I notice now that it was suggested the files were in the bbpress directory which would most likely not be the case unless perhaps someone migrated their blog from bbpress and still had that directory name – perhaps that is what you meant by saying that wasn’t what the problem was?

It’s quite often wp-config because that’s the file that gets edited more than most, but in this case the error clearly says

output started at /home/site/public_html/blog/wp-settings.php:305

Which is why I suggested replacing that file.