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What is wrong
The method Tools::displayDate was changed between 1.7.8 and 8.0.0, and this module was calling the old version, resulting in some errors in developer mode.
https://github.com/PrestaShop/PrestaShop/blob/1951311beb2497bb97659aded1b643905403becc/classes/Tools.php#L981
https://github.com/PrestaShop/PrestaShop/blob/f64f657366caf66e01f3b4fccaad4b77989a1257/classes/Tools.php#L923
How to test (do these steps on both versions)