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Kyle Nel
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September 25, 2014 at 5:22 am
Hi Folks,
I have had a look and couldn’t fin any issues matching mine (though there are a few invoice-related threads on here).
I only get this error when selecting the invoice under the payment overview on the checkout. The button in the congratulations box works perfectly. The error I am getting is:
Warning: DOMNode::cloneNode(): ID invoice already defined in /home/flmtrain/public_html/wp-content/plugins/event-espresso-core-reg/core/third_party_libs/dompdf/include/frame_decorator.cls.php on line 453
Unable to stream pdf: headers already sent
You can test the issue at this link:
http://flmtraining.co.uk/thank-you/?e_reg_url_link=1-d86d88720ad05eef3e295181a4b98e37
Cheers
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Dean
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September 25, 2014 at 5:41 am
Hi Kyle,
What PHP version are you running on the server?
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Kyle Nel
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September 25, 2014 at 5:48 am
Hi Dean,
It is 5.5.16
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Dean
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September 25, 2014 at 5:55 am
Hi,
Thanks. Do you know or can you check if OPCache is enabled in your php.ini on your server?
This error is something I have never come across before, and even Google is struggling to advise on it. That being said I came across a similar issue where OPCache was enable and caused a similar error message.
https://pyd.io/f/topic/fatal-error-call-to-a-member-function-clonenode-on-a-non-object/
https://blogs.oracle.com/opal/entry/using_php_5_5_s
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Kyle Nel
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September 25, 2014 at 6:14 am
I have sent the question to the host as I don’t believe I can check it myself and querying php_info doesn’t seem to give me that information.
I’ll let you know as soon as I hear back from them.
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Kyle Nel
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September 25, 2014 at 6:31 am
Dean, I can confirm now that OPCache is disabled on the server.
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Lorenzo Orlando Caum
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September 25, 2014 at 10:26 am
Hi Kyle,
My background is not in server administration but did you restart the server processes to clear out any old cache?
—
Lorenzo
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Kyle Nel
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September 26, 2014 at 2:22 am
Hi Lorenzo, unfortunately I am on a shared environment so I cannot restart the server process.
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Tony
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September 26, 2014 at 2:47 am
Hi Kyle,
Do you have WP_Debug or error_reporting enabled on the site?
If so can you disable it an retry please?
The warning being thrown is not a major problem (although we have a ticket to investigate this) however, I think the reason no PDF is being produced is because that warning is being displayed. Which is why, if you notice below that error, you’ll see ‘Unable to stream pdf: headers already sent’.
The headers have been sent from the warning message.
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Kyle Nel
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September 26, 2014 at 6:02 am
Hi Tony,
Thank you for that. You are correct. I disabled error_reporting within wordpress as WP_Debug was already off. Tested and the download appears to be working correctly now.
I very much appreciate your time on this.
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Tony
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September 26, 2014 at 6:14 am
Just to note, if you would like to log the errors on the site you can use something like this:
define( 'WP_DEBUG', true ); // Or false
if ( WP_DEBUG ) {
define( 'WP_DEBUG_LOG', true );
define( 'WP_DEBUG_DISPLAY', false );
@ini_set( 'display_errors', 0 );
}
That will store the error within debug.log within wp-content only when WP_Debug is enabled which allows you to debug.
For more information view here:
http://codex.wordpress.org/Editing_wp-config.php#Debug
Hope that helps.
-
This reply was modified 10 years, 2 months ago by
 Tony.
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Kyle Nel
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September 26, 2014 at 6:59 am
Now Tony, that is going the extra mile. I really appreciate you providing that extra information. Straight away that is really useful to me in a lot of situations.
Thank you very much. Have a great day.
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Tony
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September 26, 2014 at 7:38 am
No problem at all Kyle.
I’ll mark this thread resolved, if you run into any further issues, or have any further questions, feel free to open up another.
Thank you, and you too 🙂
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