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Check this tutorial to fix there has been an error processing your request in your magento 2.4 store.

[FIXED]: There Has Been An Error Processing Your Request | Magento 2.4

Magento 2: How to Add Terms and Conditions Checkbox to Checkout?

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With the Magento 1x support now expired, getting your old Magento upgraded is not just imperative for your business’s lifeline, but mandatory by order.

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