FATAL ERROR in include\module_icon.php

FATAL ERROR and Warning message with full path disclosure vulnerability when accessing directly the file \html\include\module_icon.php

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<b>Warning</b>: require_once(../../mainfile.php) [<a href='function.require-once'>function.require-once</a>]: failed to open stream: No such file or directory in <b>XXX\html\include\module_icon.php</b> on line <b>3</b><br />
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<b>Fatal error</b>: require_once() [<a href='function.require'>function.require</a>]: Failed opening required '../../mainfile.php' (include_path='.:/usr/share/pear;./XXX') in <b>XXX\html\include\module_icon.php</b> on line <b>3</b><br />