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When we install Magento 1.9 it shows: There has been an error processing your request Invalid backend name. How do i fix this?
I have already faced this issue. In your app/etc/ folder other than local.xml some backup file in end with .xml file. you can change delete that file.
This looks like a misconfigured local.xml for cache backend
Remove all code between and the cache tags
Then delete contents of var/cache/ folder in Magento.
Required, but never shown