I've seen a lot of people with this issue when trying to create a custom indexer but my issue is on a brand new install V1.9.3.1 with sample data.

When attempting to save any settings in the admin panel OR when viewing the index management screen i get:

There has been an error processing your request

Indexer model should extend Mage_Index_Model_Indexer_Abstract.

I've tried clearing the cache & checked permissions but all seems to be fine, frontend of the store is working correctly.

Any ideas why the indexer isn't working?


  • share your model code
    – sandip
    Jan 4, 2017 at 13:02
  • the model code should be un-altered, where do i find it?
    – Ben
    Jan 4, 2017 at 13:10
  • you create custom indexer, share that custom code
    – sandip
    Jan 5, 2017 at 5:05
  • no, sorry for confusion, as it says in the question i've seen this issue using a custom indexer. The indexer i'm using is the regular one, brand new install V1.9.3.1 with no custom code
    – Ben
    Jan 5, 2017 at 9:38

1 Answer 1


Fixed this issue by re-uploading the /app/code/core/Mage folder straight from the default magento install.

Magento install taken from the release archive here - https://magento.com/tech-resources/download

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