There are lots of fixes out there that sort this issue out including changing cookie_domain, changing the Admin users password in PHPMyAdmin or editing Varien.php to comment out the session code. Lately though, with the most recent versions of Magento 1 from around v1.9.3.8, this has become a bit of a problem again. Where old solutions used to work on older versions of Magento, the old solutions are not working anymore.
So, if you’re getting this error logging into your Magento ...
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