ERROR:Cannot modify header information - headers already sent

I have built a new site and am using UE to download some presentations posted on the site.
On the document result page
documents_results.php?author_surname=&category=&country=&recent=&Search.x=42&Search.y=10&Search=Search&sort=viewed&direction=DESC
if i press the Download button i get a some rubbish and some errors which mean not much to me!

If instead of i view the document and in the detail page:
documents_details.php?documentID=1&author_surname=Auckland%20SCI%20unit
i press the download button the document downloads fine.

Both pages refer to the same webassist file
<?php require_once("../webassist/file_manipulation/helperphp.php"); ?>

I'm stuck and have no idea how to fix this issue, and i have my client jumping up and down to get it solved, can someone shed some light on the issue please.

I have uploaded both source files in the zip files.

Unfortunately i had to remove the download button from the document_result page after client's request.
This is the kind of error i kept getting:

Warning: Cannot modify header information - headers already sent by (output started at /home/content/l/i/s/lisaharvey/html/documents/documents_results.php:5) in /home/content/l/i/s/lisaharvey/html/webassist/file_manipulation/helperphp.php on line 690

Warning: Cannot modify header information - headers already sent by (output started at /home/content/l/i/s/lisaharvey/html/documents/documents_results.php:5) in /home/content/l/i/s/lisaharvey/html/webassist/file_manipulation/helperphp.php on line 691

Warning: Cannot modify header information - headers already sent by (output started at /home/content/l/i/s/lisaharvey/html/documents/documents_results.php:5) in /home/content/l/i/s/lisaharvey/html/webassist/file_manipulation/helperphp.php on line 692

Warning: Cannot modify header information - headers already sent by (output started at /home/content/l/i/s/lisaharvey/html/documents/documents_results.php:5) in /home/content/l/i/s/lisaharvey/html/webassist/file_manipulation/helperphp.php on line 693
%PDF-1.4 %âãÏÓ 13 0 obj <> endobj xref 13 7 0000000016 00000 n 0000000594 00000 n 0000000657 00000 n 0000000853 00000 n 0000000895 00000 n 0000001036 00000 n 0000000436 00000 n trailer <<593D170070535FE31CA981B27C5DED90><14C7A0B257F04D1895C5E1D2AB5F10B5>]/Prev 253271>> startxref 0 %%EOF 19 0 obj <>stream hÞb```f``üÌÀÈÀ°æ.?ðÅX8w³]ëyôáCPÊFRÈÅZ³€tòj—‡ùö7 >`U@ endstream endobj 14 0 obj <> endobj 15 0 obj

Line 3 - 5 of the document results page is:
3- <?php require_once("../webassist/file_manipulation/helperphp.php"); ?>
4-
5- <?php


the blank line at line 4 is causing the error message.

Remove the blank line at line 4 to fix the error.

see the following page for details on the Headers Already sent error message:
148/

i still get the same kind of message from the document_result page

Warning: Cannot modify header information - headers already sent by (output started at /home/content/l/i/s/lisaharvey/html/documents/documents_results.php:37) in /home/content/l/i/s/lisaharvey/html/webassist/file_manipulation/helperphp.php on line 690

Warning: Cannot modify header information - headers already sent by (output started at /home/content/l/i/s/lisaharvey/html/documents/documents_results.php:37) in /home/content/l/i/s/lisaharvey/html/webassist/file_manipulation/helperphp.php on line 691

Warning: Cannot modify header information - headers already sent by (output started at /home/content/l/i/s/lisaharvey/html/documents/documents_results.php:37) in /home/content/l/i/s/lisaharvey/html/webassist/file_manipulation/helperphp.php on line 692

Warning: Cannot modify header information - headers already sent by (output started at /home/content/l/i/s/lisaharvey/html/documents/documents_results.php:37) in /home/content/l/i/s/lisaharvey/html/webassist/file_manipulation/helperphp.php on line 693
%PDF-1.3 %âãÏÓ 6 0 obj <> endobj xref 6 49 0000000016 00000 n 0000001519 00000 n 0000001596 00000 n 0000002086 00000 n 0000002547 00000 n 0000003070 00000 n 0000003311 00000 n 0000003346 00000 n 0000003391 00000 n 0000003436 00000 n 0000003481 00000 n 0000003526 00000 n 0000003571 00000 n 0000004929 00000 n 0000006175 00000 n 0000006573 00000 n 0000006918 00000 n 0000008234 00000 n 0000009521 00000 n 0000010753 00000 n 0000012100 00000 n 0000013493 00000 n 0000014547 00000 n 0000017216 00000 n 0000017573 00000 n 0000017932 00000 n 0000018293 00000 n 0000018649 00000 n 0000019006 00000 n 0000019071 00000 n 0000035434 00000 n 0000035618 00000 n 0000062106 00000 n 0000062298 00000 n 0000077211 00000 n 0000077405 00000 n 0000089796 00000 n 0000089981 00000 n 0000106043 00000 n 0000106221 00000 n 0000132037 00000 n 0000132360 00000 n 0000132691 00000 n 0000133021 00000 n 0000139584 00000 n 0000162609 00000 n 0000184694 00000 n 0000185019 00000 n 0000001276 00000 n trailer

I will temporeraly leave the page with the download button visible so that you can reproduce the error!
documents_results.php?author_surname=&category=&country=&recent=&Search.x=37&Search.y=6&Search=Search&sort=viewed&direction=DESC
I have also attached the amended file with no space so that you can have a closer look!
Cheers

It's the same issue.


Your page has blank lines between php tags at line 4, 37, 53.

at line 134, there is a comment between the code blocks:
<?php
/* Updates download field when download button pressed*/?>
<?php


and another blank line at line 141.


the error points to exactly where the problem is:
output started at /home/content/l/i/s/lisaharvey/html/documents/documents_results.php:37

Please visit this page for information on the cause of the error:
148/

amazing work Jason!

Thank you so much!