Fatal error: Cannot override final method

Question

Im pretty new in magento developing: just bought custom theme and after its installation I've got next message on account page:

Fatal error: Cannot override final method Mage_Core_Model_Abstract::clearInstance() in app/code/core/Mage/Catalog/Model/Product.php on line 39

I didn't touch any core files. Could anyone tell me where to dig?

Answer 1

Seen this problem with APC before, add the following to your apc.ini

apc.include_once_override=0

Answer 2

I cannot comment, but did you delete the var/cache directory via ftp? This function is assigned with a cache tag so I could see this being an issue. If that has already been done do you have apc cache enabled? If so maybe try restarting the web server.

Answer 3

Same solution as above (thanks JohnBoy I forgot about apc) but I believe you can add this per domain by doing this in the virtual host setup, saves applying to the global apc setup.

php_flag apc.include_once_override 0

Answer 4

restarting apache cleaned this up for me, see post by Reedz here: http://www.magentocommerce.com/boards/viewthread/378965/

Answer 5

If you have a situation (as I did) where apc.include_once_override=0 and restarting apache doesn't work, try disabling apc (I did it in httpd.conf) restarting apache and then re-enabling apc, this solved the problem. Not 100% why but guessing it caused some kind of flushing of the apc cache.