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Upgrading from 1.4.8 to 1.5


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What are you doing when you receive the white page and error message?  Can you access your back office at all?

 

I would probably start by clearing your browser cache and cookies to make sure you are using the latest versions of javascript and css.  I would also try to rename the file "/cache/class_index.php" to "class_index.php.old" and then reload your back office to see if it re-generates properly.

 

report back after doing those things

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Assuming you did this against your live store, then I would revert your store back to 1.4.8 using your backups (you did backup right?). 

 

Then test the upgrade process on a duplicate copy of the store, and ditch the auto-upgrade module if it continues to fail.  I would suggest doing a manual upgrade or hire a professional with experience performing upgrades.

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