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I have set-up a Magento cart system and got everything working the way i want, but somehow in the process this error has came up.

The address total model should be extended from Mage_Sales_Model_Quote_Address_Total_Abstract.

This error only comes up when i try to add things to my cart. Has anyone else encountered this error or know how to fix it?

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What version of magento? –  JMC Dec 20 '11 at 21:14
    
By "got everything working the way I want", do you mean you've made modifications? If so - what? –  Anonymous Dec 21 '11 at 12:02
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2 Answers 2

I fixed this problem by reinstalling the CORE Magento module, I created this problem by editing the core files.

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Never, ever, edit core files (unless there's an urgent security issue that can't be fixed any other way and you're absolutely sure the manual patch is safe). There's a reason why these platforms have extensible architectures. –  Lèse majesté Jan 26 '12 at 18:30
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