Cannot modify header information – Warning !

Yes it did help.

At the end of
/home/xyz/public_html/wp-includes/post.php:5254
there was a line as follows-
“//Do Not Delete This code line PCJ”

I removed this line in the php file that was causing the problem.But I am still facing the problem.The line again appears at the end of the php file and i dont know why.

I changed the post.php file’s permission and set it to non writable,but even then after running site once,somehow this line gets added at the end of post.php file.

Please help….