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Problem after clearing the cache and installing the payment module.

Problem after clearing the cache and installing the payment module.

Hi

I installed the module and cleared the caches. I got this error when trying to log in a client. Fatal error: Uncaught Error: Undefined class constant HASH_VERSION_MD5 /app/code/core/Mage/Customer/Model/Observer.php

 

How to solve this problem?

Thank you