Hi, what's the current version that you use? Note that the community has shared free modules at the end of the article (see previous tweet) which might help you.
— PrestaShop (@PrestaShop) April 16, 2018
If the problem persists, feel free to call us: +44 .2 036.971.999.
https://goo.gl/EO0ad1
https://goo.gl/xF8heB