PDF File Read error

My erro log shows an error when users try to access a PDF file.
I have uploaded the file to an UPLOAD folder wp-content/uploads/2014/01/gwcc-bylaws.pdf. I get this error in the log:

[09-Mar-2014 23:52:38 America/Denver] PHP Warning: readfile(www.gwcc.org.nz/wp-content/uploads/2014/01/gwcc-bylaws.pdf): failed to open stream: No such file or directory in /home4/thefarmn/public_html/gwccorg/gwcc-bylaws.php on line 10

my php file:
<?php
header(“Pragma: public”);
header(“Expires: 0”);
header(“Cache-Control: must-revalidate, post-check=0, pre-check=0”);
header(“Cache-Control: private”,false);
if (true) { // (!Operating_System_Is_IOS)
header(“Content-disposition: attachment; filename=gwcc-bylaws.pdf”);
}
header(“Content-type: application/pdf”);
readfile(“www.gwcc.org.nz/wp-content/uploads/2014/01/gwcc-bylaws.pdf”);

?>

When I test it seems to work.
In other places on my site I think I just insert an hyperlink to the file instead of using the PHP for access. When I test (PC / Windows XP chrome) both seems to work.

Any help would be appreciated. Is it the PHO file? Do I need to do something special for different browsers? different OS? Should the URL be replaced with a directory/file location instead?

Thanks.