Magento : PHP extension “mcrypt” must be loaded
The above message tells us that your PHP do not have “mcrypt” compiled with it. You have to get your web host to re-compile PHP with “mcrypt”. A few PHP extensions are needed in order to run magento properly.
Easy fix, despite the official line from PHP which says you need to recompile PHP –with-mcrypt.
I’ll caveat this by stating I’m using Fedora Core 7…
1) At the terminal, su root – you are now going to yum, not ./configure, make, and make install…
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2) yum install mcrypt – this will get you libmcrypt, mhash, and mcrypt
3) yum install php-mcrypt – this will get you the functionality within PHP
Uh…done (without hassles).
For more information please refer magento discussion board .enjoy 😉