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Hi..

first you need enable debug mode for prestashop read this

https://www.prestashop.com/forums/topic/575132-how-to-enable-debug-mode-on-prestashop-17-and-older-versions-turn-on-error-reporting-blank-page/

then after you can see the all error when you open backoffice. on that error find error on ps fourm and i say all problem solution you get this forum.

Thanks