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I'm using the default comments template. When I send a comment I get the following error message:

Warning: call_user_func_array() expects parameter 1 to be a valid callback, function 'wp_set_comment_cookies' not found or invalid function name in /home/mattator/public_html/wp-includes/plugin.php on line 403

Warning: Cannot modify header information - headers already sent by (output started at /home/mattator/public_html/wp-includes/plugin.php:403) in /home/mattator/public_html/wp-includes/pluggable.php on line 881

couldn't find a call to the funciton 'wp_set_comment_cookies' anywhere in the code. It is noteworthy that despite the error message the comment is being sent properly. Any ideas would be appreciated.

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What Theme are you using? What Plugins are active? – Chip Bennett Aug 20 '12 at 16:25
I'm using my own self-built theme. I am using the native WP comments template. Turned off all plugins and the problem still persists. – Matanya Aug 27 '12 at 9:41
What "native WP comments template" are you using? – Chip Bennett Aug 27 '12 at 13:15
I'm using the "comments_template()" function with no additional parameters, which loads the default "comments.php" from the wp-includes library. codex.wordpress.org/Function_Reference/comments_template – Matanya Aug 27 '12 at 15:56

2 Answers

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I'm using the "comments_template()" function with no additional parameters, which loads the default "comments.php" from the wp-includes library.

That's your problem.

The compat version is unmaintained and obsolete. Theme-compat files are officially no longer supported, as of WordPress 3.0. (See here.)

You need to define and include comments.php in your Theme.

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Thanks. Does that mean that I have to create the whole comment system from scratch, or is there a more up-to-date file I can refer to? – Matanya Aug 28 '12 at 8:17
I tried the twentyeleven comments template and got the same error – Matanya Aug 28 '12 at 8:45
Exactly the same error? Can we see relevant code? Your comments.php, relevant parts of functions.php, and template file(s) where you call comments_template()? – Chip Bennett Aug 28 '12 at 13:24
up vote 0 down vote accepted

Well, I experimented a little bit, and as turns out the problem was a call to the function "nocache_headers()", in Line 18 of the file "wp-comments-post.php" which lies at WP root directory.
I deleted it, and voila, everything works. Not sure why though.

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