By default Magento has disabled output of the exception / error details which makes it impossible to debug for developers.
There has been an error processing your request
Exception printing is disabled by default for security reasons.
And that’s it. Not nearly enough information to make it right. We need the error details.
To make it display error details and problem traces, FTP to your Magento installation and go to /errors/, and rename local.xml.sample to local.xml. (without the last dot, it’s the period punctuation)
Now the error should be much more useful by showing a lot more details: descriptive error message, traces, and line of code that is at fault.
Make sure you change local.xml back to local.xml.sample to disable detailed error output for production site for the sake of security.
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