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encryption error?

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I had installed Prestashop and was able to work in the back office, connect to Paypal, install a theme, products, etc. However, when I was working to put in some product pictures, I started getting the dreaded Error 500 page, and I cannot log in or see anything in the back office any longer (The story is not yet live). I've tried just about everything. I have turned on error reporting, and now when I try to get the page I get a message reading


Fatal error: Call to undefined function mcrypt_decrypt() in /home/ljpieper/public_html/taucrossbooks/store/classes/Rijndael.php on line 71


The line in question says


return substr(mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $this->_key, base64_decode($ciphertext), MCRYPT_MODE_ECB, $this->_iv), 0, $length);


This baffles me completely. It clearly has to do with encryption, but I don't know anything else. Where would this function be defined and what can I do about it?


Please help.

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