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What version of php are you running? According to the php documentation:
Quote:
On Windows versions prior to PHP 4.3.0, the following functions do not support remote file accesing: include(), include_once(), require(), require_once() and the imagecreatefromXXX functions in the Reference XL, Image functions extension.
If you are running a version greater than 4.3.0 check the value of the "allow_url_fopen" setting in your php.ini
Also, the error message doesn't make this clear, but if the included page is on the local machine, try giving the local path to the file. Instead of this:
include(XOOPS_URL.'/modules/mytrades/go.php');
try this:
include(XOOPS_ROOT_PATH.'/modules/mytrades/go.php');