Issue:
I am using version 1.3.9 (the latest version); Magento version: 2.4.4 and PHP version: 8.1. And I am getting this error in compile step:

Solution:
The issue is due to the incompatible with M2.4.4 at this time.
To solve it, please change the code in this file
app/code/Bss/FastOrder/Helper/Cart.php

Please apply the change on the site.
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