ecshop creates new php file require_once error

[backcolor=white !important][size=1em][backcolor=rgb(245, 245, 245) !important]PHP code

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[size=1em][size=1em]require_once(ROOT_PATH . 'includes/lib_order.php');

ecshop created a new php file. When executing require_once, an error occurred and the execution was stopped.
The same similar files and the same code will be fine. What is the question?
Please feel free to teach me!