After I implemented the patch SUPEE 10415, checkout cart url /checkout/cart/ got an error, and when I reverted the Patch it now works as expected but I need to implement the patch asap.
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After patching SUPEE-10415, causes an error “Unsupported data type N” Solution: The cause of this issue is not having SUPEE-8788 V2 installed. To fix this, download Magento 18.104.22.168 and copy
lib/Unserialize/Parser.php lib/Unserialize/Reader/Arr.php lib/Unserialize/Reader/ArrValue.php lib/Unserialize/Reader/Null.php
files to your website. check if any changes between files.
Please take Security Patch SUPEE-10415 - Possible Issues? as reference.
Please follow below steps.
(1) First revert the patch if applied.
(2) Check your current magento version and download same fresh version.
(3) Just put
lib/Unserialize/Reader/Arr.php file from downloded version
(4) Now apply patch again .
Error will be resolved. Dont forget to clear cache.