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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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    From what I can tell Mage_Categorygroup_Helper_Data doesn't exist in core Magento. Have you installed any custom modules? Have you tried clearing the cache? – Dave Jul 13 '14 at 13:44
  • yes this happened right after reindexing and clearing the cache @Dave – Moh3n Jul 13 '14 at 16:34
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What happend (I can only guess) you installed/implemented a new module where the helper node in config.xml (/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.

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