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    Mage registry key “_singleton/core/resource” already exists

    Mage registry key “_singleton/core/resource” already exists : is a very common problem during magento update and due to this issues many time we are getting the erros in the page “There has been an error processing your request” . In my case i found the issue is due to cache so what i did i cleaned my cache every time through index.php  of magento .

    i found two solution of this problem

    Solution One :

    Try to add this code in index.php line , this code will delete the cache every time .


    Solution Two

    Go to this location  lib/Zend/Cache/Backend and open file.php  and replace the following code


    with this


    and comment the following code in index.php

    . . .

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