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Property SpecificPrice : from is not valid

Your CSV import process stops and displays the following error:

Fatal error: Uncaught exception 'PrestaShopException' with message 'Property SpecificPrice->From is not valid'

This error means that a 'from date' of the specific price in your csv file is incorrect.

The format has to be YYYY-MM-DD hh:mm:ss

Modify your csv file and you'll be able to start your import again.