Warning: Cannot modify header information - headers already sent by (using Worldpay)

[dfltech]

I am sorry to say, but the error seems to be beyond the support of the zen cart vendor itself.....

[Website Rob]

If you're not happy with the script you can always ask for your money back.

Otherwise, were edits done to the files in question? That specific error msg. is common when syntax has been incorrectly changed. This can include spaces after the ?> at the page bottom.

[DrByte]

It would seem that you have something running in a template file which is trying to do a redirect *after* the page has started drawing ... hence the "headers already sent" message appearing when the redirect header-change function gets called.

You made mention of "Worldpay". What happens if you turn off the worldpay module and enable the Check/MoneyOrder module instead? Does the error go away? If so, then logic would suggest that the problem is somewhere in the Worldpay module you're using.

[linivan]

It would seem that you have something running in a template file which is trying to do a redirect *after* the page has started drawing ... hence the "headers already sent" message appearing when the redirect header-change function gets called.

You made mention of "Worldpay". What happens if you turn off the worldpay module and enable the Check/MoneyOrder module instead? Does the error go away? If so, then logic would suggest that the problem is somewhere in the Worldpay module you're using.

Hi all

I have the same problem.
I believe nothing to do with the additional space problem.
If I don't select worldpay and use paypal or COD, then everythinng works fine.

[beatnik]

If you're not happy with the script you can always ask for your money back.

Otherwise, were edits done to the files in question? That specific error msg. is common when syntax has been incorrectly changed. This can include spaces after the ?> at the page bottom.

That worked for me... Thanks

[digimac]

Hi Guys,

Hope you can help.
I have the same issue as described in one of the above posts:
Warning: Cannot modify header information - headers already sent by (output started at /home/*****/public_html/includes/templates/ZC03C00094/common/html_header.php:22) in /home/*****/public_html/includes/functions/functions_general.php on line 44

I have tried everything suggested in this post and others and am still getting this error.

The error is appearing when Worldpay calls back to the Zen Cart site so the order doesn't complete as the callback is incomplete.

I have tried reinstalling worldpay, changing templates, all the suggestions that have been made in this thread so far and still no luck.

The site is Zen Cart version 1.3.7 and the server is running PHP 5.2.5
Any help with this issue would be much appreaciated.

Cheers
Brian

[DrByte]

So, what exactly did you do about the error happening in your html_header.php file? (as per the FAQ I mentioned in my earlier post in this thread)

And who built your template? Maybe they can be of some assistance in fixing the problem?

[digimac]

Hi Dr Byte,

Thanks for the response.
I have had a look at the files in question and checked for any spaces at the end of php tags, removed any that I found, tried using the classic template instead of the one being used on the site and still got the same error message.
I reinstalled worldpay using the most recent download available just in case something in there wasn't working correctly.

Im basically at a total loss as to what to try next

Cheers
Brian

[DrByte]

If you've tried switching to "classic" template, did the error message change at all?
Because ... the message you quoted was specific to your ZC03C00094 template:

Warning: Cannot modify header information - headers already sent by (output started at /home/*****/public_html/includes/templates/ZC03C00094/common/html_header.php:22)

[digimac]

This is the warning I get using the classic template

Warning: Cannot modify header information - headers already sent by (output started at /home/*****/public_html/includes/templates/template_default/common/html_header.php:22) in /home/*****/public_html/includes/functions/functions_general.php on line 43

Thanks again for the help
Brian