Did you try 777 ?
Your template file says:
PHP Code:
<?php require($define_main_page); ?>
and $define_main_page is a variable that is set in the /includes/modules/pages/index/header_php.php around line 49:
PHP Code:
$define_main_page = zen_get_file_directory(DIR_WS_LANGUAGES . $_SESSION['language'] . '/html_includes/', FILENAME_DEFINE_MAIN_PAGE, 'false');
That is looking for the includes/languages/english/html_includes/mred/define_main_page.php and if it can't find that it will look for includes/languages/english/html_includes/define_main_page.php
If it can't find either of those then you'll get the error you reported.
Either that, or your template file uses something other than "$define_main_page" and the header_php.php uses something else; thus the value of the variable is blank, and when the "require()" command attempts to access it, it is forced to try loading a file whose name is blank. Thus the error.
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