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

[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

[DrByte]

Okay, must be something unique to your payment module.

A regular Zen Cart page starts drawing its page content via html_header.php.
The only reason to get a "headers already sent" error in that case is if you're using addon code that attempts to redirect to another page after already drawing part of the current page ... which must be what your payment module is trying to do somehow.

[digimac]

I replaced the install of worldpay with the one available in the downloads section of Zen Cart and still get the same error when I am transfered back to the Zen cart site from worldpay.

I have not modified the worldpay module code in anyway. Is there any other files that are called in the callback process that might be causing this error?

Cheers
Brian

[DrByte]

Someone familiar with the worldpay module would be better suited than me to answer those questions. I've never used it.

[misty]

Developer of World Pay mod's support thread can be found at
http://www.zen-cart.com/forum/showthread.php?t=39106
HTH

[hayden]

got mine working again from blank page errors, i installed debug_error_logging_utility_1-0.zip , this helped me narrow it down to a file named english.php in my /www/includes/languages/ and another copy in my custom folder. they both had rogue white space at the end.. changing template to default b4 fixing corrected error, removing white space did to bet i can keep using my custom template.

[spazem]

thankyou for this help in this thread. The debugger utility saved me. I have been racking my brain for hours on a fix. It was the space at the end of my english.php

when someone has a chance can you please goto our site and just add something to your cart to check that its not a white screen. more testing doesn;t help.

www.registersonline.com.au

i am very knew at this and doing this for my work. its a steep learning curve but all the forums help saves the day again

very happy :):)