in Prestashop 1.6.1.15 the Prestashop Checkout module not connecting with my account and Round Pricing Error comes everytime.

[adamthomson123]

hi, 

we are using prestashop since 2013. last week we hired a freelancer to upgrade our website from 1.6.1.15 to 8.0 but he failed and then restored the previous version. but since then we are having issues with the prestashop checkout module it is not working at all. and it show error of "Round Pricing" all the time. we have attached screenshot.

it is not connecting with our account and not signing up for new account. clicking on any button doesn't help at all. 

how to get connected with our account? please advise

Kind regards

[Nickz]

I think you are in the wrong part of the forum.

Check your PHP Version. Should you want to use your shop under a more current PHP version you could use a Thirtybees