im new in magento. i got this error in Magento backend right after reindexing and clearing the cache:
Fatal error: Class 'Mage_Categorygroup_Helper_Data' not found in /app/Mage.php on line 547
my backend is not working. what should i do?
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What happend (I can only guess) you installed/implemented a new module where the helper node in
/config/global/helpers/<your_module_name>/class) is missing.
The fallback of magento is to try mage_/.
And then this error is thrown.
It only happend after cleaning the cache, because the old config (without the module loaded) was cached and used.