PHP Fatal Error in tpl_checkout_success_default - Missing Define Page

[dgent]

[10-Jul-2014 18:20:41 Europe/London] PHP Warning: require() [<a href='function.require'>function.require</a>]: Filename cannot be empty in includes/templates/pure_green/templates/tpl_checkout_success_default.php on line 64

[10-Jul-2014 18:20:41 Europe/London] PHP Warning: require() [<a href='function.require'>function.require</a>]: Filename cannot be empty in includes/templates/pure_green/templates/tpl_checkout_success_default.php on line 64

[10-Jul-2014 18:20:41 Europe/London] PHP Fatal error: require() [<a href='function.require'>function.require</a>]: Failed opening required '' (include_path='.:/usr/lib/php:/usr/local/lib/php') in includes/templates/pure_green/templates/tpl_checkout_success_default.php on line 64

Lines 60-65 in tpl_checkout_success_default.php

60 <?php
61 /**
62 * require the html_defined text for checkout success
63 */
64 require($define_page);
65 ?>

Can anyone help with this problem?

[dgent]

No bother, for some reason my header.php file had vanished from my modules/pages/checkout_success folder.