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?

  • 1
    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

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.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.