Title: Valid Callback Errors on comment-template.php Last modified: August 19, 2016 --- # Valid Callback Errors on comment-template.php * [fmckinnon](https://wordpress.org/support/users/fmckinnon/) * (@fmckinnon) * [15 years, 8 months ago](https://wordpress.org/support/topic/valid-callback-errors-on-comment-templatephp/) * OK – I had the vBulletin Bridge enabled on our wordpress site, and we were using vbulletin as our comment engine. I disabled it, and now, all of the twitter and/ or pingback links/comments are showing up throughout the site with the following errors: * Warning: call_user_func(twentyten_comment) [function.call-user-func]: First argument is expected to be a valid callback in /home2/twcadmin/public_html/wp-includes/ comment-template.php on line 1335 * As best as I can tell, any previous comments (actual comments) are gone, which makes sense, because they are in the vbulletin forums. * All of these errors seem to be where a trackback (mostly tweets, RTs, etc) would have been. * Any suggestions on how to clean it up? See an example at: [http://www.theworshipcommunity.com/sunday-setlists-110/](http://www.theworshipcommunity.com/sunday-setlists-110/) Viewing 9 replies - 1 through 9 (of 9 total) * Thread Starter [fmckinnon](https://wordpress.org/support/users/fmckinnon/) * (@fmckinnon) * [15 years, 8 months ago](https://wordpress.org/support/topic/valid-callback-errors-on-comment-templatephp/#post-1650452) * OK – this apparently has NOTHING to do w/ the vbulletin bridge – I’ve totally removed it and uploaded all new install of wordpress … * This error is happening everywhere – even when users leave comments: * Warning: call_user_func(twentyten_comment) [function.call-user-func]: First argument is expected to be a valid callback in /home2/twcadmin/public_html/wp-includes/ comment-template.php on line 1335 * Warning: call_user_func(twentyten_comment) [function.call-user-func]: First argument is expected to be a valid callback in /home2/twcadmin/public_html/wp-includes/ comment-template.php on line 1335 * I’ve googled and searched and I’m finding tons of sites generating this error in the last few days. * **DOES ANYONE KNOW HOW TO FIX THIS?** * [dgraydesign](https://wordpress.org/support/users/dgraydesign/) * (@dgraydesign) * [15 years, 7 months ago](https://wordpress.org/support/topic/valid-callback-errors-on-comment-templatephp/#post-1650514) * I’m experiencing the same thing. If you figured it out, I’d love to know the solution. If not, it would be nice if someone could help out. * [dgraydesign](https://wordpress.org/support/users/dgraydesign/) * (@dgraydesign) * [15 years, 7 months ago](https://wordpress.org/support/topic/valid-callback-errors-on-comment-templatephp/#post-1650515) * Just found this fix on another forum post. It works: * edit this line from comments.php: wp_list_comments( array( ‘callback’ => ‘twentyten_comment’)); and change ‘tentyten_comment’ to the function name of an existing ‘comments’ function; i.e. the name of the comments function you are working on at the moment in functions.php of the theme. * or bring it back to the ’empty’ state: wp_list_comments(); which should remove the error message. * [bcinelli](https://wordpress.org/support/users/bcinelli/) * (@bcinelli) * [15 years, 2 months ago](https://wordpress.org/support/topic/valid-callback-errors-on-comment-templatephp/#post-1650559) * I found the fix to this error. For some reason the coding was picking up one of the default themes that comes with wordpress that has the twentyten coding in it. I went into the default WordPress theme and pulled out the comments.php code and pasted it into my comments.php on my new custom made theme. * Bingo Bango Bongo .. worked perfectly. Here’s the coding so you don’t have to go far. * _[Code moderated as per the [Forum Rules](http://codex.wordpress.org/Forum_Welcome). Please use the [pastebin](http://wordpress.pastebin.com/)]_ * [bookyeti](https://wordpress.org/support/users/bookyeti/) * (@bookyeti) * [15 years, 1 month ago](https://wordpress.org/support/topic/valid-callback-errors-on-comment-templatephp/#post-1650561) * **dgraydesign** – I just want to thank you very much for posting your solution. I just upgraded to 3.1.1 and got the same error message wherever someone left a comment. I followed the instructions you posted and it solved the problem. 🙂 * [dgraydesign](https://wordpress.org/support/users/dgraydesign/) * (@dgraydesign) * [15 years, 1 month ago](https://wordpress.org/support/topic/valid-callback-errors-on-comment-templatephp/#post-1650562) * **bookyeti** – glad it worked for you! * [Chuck Reynolds](https://wordpress.org/support/users/ryno267/) * (@ryno267) * [15 years ago](https://wordpress.org/support/topic/valid-callback-errors-on-comment-templatephp/#post-1650571) * if you’re doing this with custom theme based off of twentyten or a child theme of twentyten you need to then include the twentyten_comments() function from twentyten/functions.php into your functions file. It’s erroring because that function isn’t there * [soflanetworking](https://wordpress.org/support/users/soflanetworking/) * (@soflanetworking) * [14 years, 9 months ago](https://wordpress.org/support/topic/valid-callback-errors-on-comment-templatephp/#post-1650576) * was having this error on all of [IT Solutions blog post](http://soflanetworking.com/wordpress/) * It was nice being able to find this post, it fixed my issue straight away. * [drunberg_collegian](https://wordpress.org/support/users/drunberg_collegian/) * (@drunberg_collegian) * [14 years, 8 months ago](https://wordpress.org/support/topic/valid-callback-errors-on-comment-templatephp/#post-1650577) * I’m having this same problem, except I don’t have a comments.php file. There is just comment.php and comment-template.php. The comment.php in my theme looks very different from the comments.php in the default theme. It doesn’t even have the wp_list_comments( array( ‘callback’ => ‘twentyten_comment’ ) ); line in it, so I don’t really know what to do. * I’m using a custom made theme from someone who designed it for our college newspaper last year, so I’m kind of walking into this blind. Anybody have any ideas? Thanks. Viewing 9 replies - 1 through 9 (of 9 total) The topic ‘Valid Callback Errors on comment-template.php’ is closed to new replies. * In: [Fixing WordPress](https://wordpress.org/support/forum/how-to-and-troubleshooting/) * 9 replies * 7 participants * Last reply from: [drunberg_collegian](https://wordpress.org/support/users/drunberg_collegian/) * Last activity: [14 years, 8 months ago](https://wordpress.org/support/topic/valid-callback-errors-on-comment-templatephp/#post-1650577) * Status: not resolved ## Topics ### Topics with no replies ### Non-support topics ### Resolved topics ### Unresolved topics ### All topics